OSPF

Router ID

The Router ID uniquely identifies the router in the autonomous system. The router ID is used by the BGP and OSPF protocols. We recommend setting the router ID rather than relying on the default setting. This prevents the router ID from changing if the interface used for the router ID goes down. Use an address on a loopback interface that is not the loopback address (127.0.0.1). In a cluster, you must select a router ID and make sure that it is the same on all cluster members.

• Range: Dotted-quad.([0-255].[0-255].[0-255].[0-255]). Do not use 0.0.0.0
• Default: The interface address of one of the local interfaces.

RFC1583 Compatibility

This implementation of OSPF is based on RFC2178, which fixed some looping problems in an earlier specification of OSPF. If your implementation is running in an environment with OSPF implementations based on RFC1583 or earlier, enable RFC 1583 compatibility to ensure backwards compatibility.

• Default: Selected

SPF Delay

Specifies the time in seconds the system will wait to recalculate the OSPF routing table after a change in topology.

• Default: 2.
• Range: 1-60.

SPF Hold Time

Specifies the minimum time in seconds between recalculations of the OSPF routing table.

• Default:5.
• Range: 1-60.

Default ASE Route Cost

Specifies a cost for routes redistributed into OSPF as ASEs. Any cost previously assigned to a redistributed routed overrides this value.

Default ASE Route Type

Specifies a route type for routes redistributed into OSPF as ASEs, unless these routes already have a type assigned.

There are two types:

• Type 1 external: Used for routes imported into OSPF which are from IGPs whose metrics are directly comparable to OSPF metrics. When a routing decision is being made, OSPF adds the internal cost to the AS border router to the external metric.
• Type 2 external: Used for routes whose metrics are not comparable to OSPF internal metrics. In this case, only the external OSPF cost is used. In the event of ties, the least cost to an AS border router is used.

Graceful Restart Helper

When a router running OSPF restarts, all the routing peers detect that the session failed and recovered. This transition results in a routing flap. It causes routes to be recomputed, updates to be generated, and unnecessary churn to the forwarding tables.

Enabling this option minimizes the negative effects caused by peer routers restarting by causing the Check Point system to maintain the forwarding state advertised by peer routers even when they restart.

Add Address Range

You can configure any area with any number of address ranges. Use these ranges to reduce the number of routing entries that a given area emits into the backbone and thus all areas. If a given IPv4 address aggregates a number of more specific IPv4 addresses within an area, you can configure an address that becomes the only IPv4 address advertised into the backbone. You must be careful when configuring an address range that covers parts of an IPv4 address not contained within the area. By definition, an address range consists of a IPv4 address and a mask length.

Note: To prevent a specific IPv4 address from being advertised into the backbone, select Restrict.

Add Stub Network

OSPF can advertise reachability to IPv4 addresses that are not running OSPF using a stub network. The advertised IPv4 address appears as an OSPF internal route and can be filtered at area borders with the OSPF area ranges. The IPv4 address must be directly reachable on the router where the stub network is configured; that is, one of the router's interface addresses must fall within the IPv4 address to be included in the router-LSA. You configure stub hosts by specifying a mask length of 32.

This feature also supports advertising an IPv4 address and mask that can be activated by the local address of a point-to-point interface. To advertise reachability to such an address, enter an IP address and a cost with a value other than zero.

Area Type

For descriptions of area types, see Types of Areas.

Options: Normal/Stub/NSSA.

Import Summary Routes

Specifies if summary routes (summary link advertisements) are imported into the stub area or NSSA. Each summary link advertisement describes a route to a destination outside the area, yet still inside the AS (i.e. an inter-area route). These include routes to networks and routes to AS boundary routers.

• Default: Selected.

Translator Role

Specifies whether this NSSA border router will unconditionally translate Type-7 LSAs into Type-5 LSAs. When role is Always, Type-7 LSAs are translated into Type-5 LSAs regardless of the translator state of other NSSA border routers. When role is Candidate, this router participates in the translator election to determine if it will perform the translations duties. If this NSSA router is not a border router, then this option has no effect.

• Default: Candidate.

Translator Stability Interval

Specifies how long in seconds this elected Type-7 translator will continue to perform its translator duties once it has determined that its translator status has been assumed by another NSSA border router. This field appears only if an area is defined as an NSSA with translator role as Candidate.

• Default: 40 seconds.

Import Summary Routes

Specifies if summary routes (summary link advertisements) are imported into the stub area or NSSA. Each summary link advertisement describes a route to a destination outside the area, yet still inside the AS (i.e. an inter-area route). These include routes to networks and routes to AS boundary routers.

• Default: On.

Cost for Default Route

Enter a cost associated with the default route to the NSSA.

Default Route Type

Specifies the route type associated with the Type-7 default route for an NSSA when routes from other protocols are redistributed into OSPF as ASEs. If a redistributed route already has a route type, this type is maintained. If summary routes are imported into an NSSA, only then a Type-7 default route is generated (otherwise a Type-3 default route is generated). This field appears only if an area is defined as an NSSA into which summary routes are imported.

The route type can be either 1 or 2. A type 1 route is internal and its metric can be used directly by OSPF for comparison. A type 2 route is external and its metric cannot be used for comparison directly.

• Default: 1

Redistribution

Specifies if both Type-5 and Type-7 LSAs or only Type-7 LSAs will be originated by this router. This option will have effect only if this router is an NSSA border router and this router is an AS border router.

• Default: On

Type 7 Address Ranges

An NSSA border router that performs translation duties translates Type-7 LSAs to Type-5 LSAs. An NSSA border router can be configured with Type-7 address ranges. Use these ranges to reduce the number of Type-5 LSAs. Many separate Type-7 networks may fall into a single Type-7 address range. These Type-7 networks are aggregated and a single Type-5 LSA is advertised. By definition, a Type-7 address range consists of a prefix and a mask length.

Note: To prevent a specific prefix from being advertised, select On in the Restrict field next to the entry for that prefix.

Area

The drop-down list displays all of the areas configured and enabled on your platform. An entry for the backbone area is displayed even if it is disabled.

An OSPF area defines a group of routers running OSPF that have the complete topology information of the given area. OSPF areas use an area border router (ABR) to exchange information about routes. Routes for a given area are summarized into the backbone area for distribution into other non‑backbone areas. An ABR must have at least two interfaces in at least two different areas.

For information on adding an area Configuring OSPF Areas and Global Settings.

Hello interval

Specifies the length of time in seconds between hello packets that the router sends on this interface. For a given link, this value must be the same on all routers, or adjacencies do not form.

• Range: 1-65535 in seconds
• Default: For broadcast interfaces, the default hello interval is 10 seconds. For point-to-point interfaces, the default hello interval is 30 seconds.

Dead interval

Specifies the number of seconds after the router stops receiving hello packets that it declares the neighbor is down.

• Recommended value: Four times the hello interval. For a given link, this value must be the same on all routers, or adjacencies do not form. The value must not be 0.
• Range: 1-65535 in seconds.
• Default: For broadcast interfaces, the default dead interval is 40 seconds. For point-to-point interfaces, the default dead interval is 120 seconds.

Retransmit interval

Specifies the number of seconds between LSA retransmissions for this interface. This value is also used when retransmitting database description and link state request packets. Set this value well above the expected round-trip delay between any two routers on the attached network. Be conservative when setting this value to prevent necessary retransmissions.

• Range: 1-65535 in seconds.
• Default: 5.

OSPF cost

Specifies the weight of a given path in a route. The higher the cost you configure, the less preferred the link as an OSPF route. For example, you can assign different relative costs to two interfaces to make one more preferred as a routing path. You can explicitly override this value in route redistribution.

• Range: 1-65535.
• Default: 1.

Election priority

Specifies the priority for becoming the designated router (DR) on this link. When two routers attached to a network both attempt to become a designated router, the one with the highest priority wins. If there is a current DR on the link, it remains the DR regardless of the configured priority. This feature prevents the DR from changing too often and applies only to a shared-media interface, such as Ethernet. A DR is not elected on point-to-point type interfaces. A router with priority 0 is not eligible to become the DR.

• Range: 0-255.
• Default: 1.

Passive

Specifies that the interface does not send hello packets, which means that the link does not form any adjacencies. This mode enables the network associated with the interface to be included in the intra-area route calculation rather than redistributing the network into OSPF and having it as an ASE. In passive mode, all interface configuration information, with the exception of the associated area and the cost, is ignored.

• Options: On or Off.
• Default: Off.

Use Virtual Address

Makes OSPF run only on the VRRP Virtual IP address associated with this interface. If this router is not a VRRP master, then OSPF will not run if this option is On. It will only run on the VRRP master. You must also configure VRRP to accept connections to VRRP IPs. For more information, see Configuring Monitored-Circuit VRRP.

• Options: On or Off.
• Default: Off

Authorization Type

Specifies which type of authentication scheme to use for a given link. In general, routers on a given link must agree on the authentication configuration to form neighbor adjacencies. This feature guarantees that routing information is accepted only from trusted routers.

Options are:

• None: Does not authenticate packets.

  This is the default option.

• Simple: Uses a key of up to eight characters. Provides little protection because the key is sent in the clear, and it is possible to capture packets from the network and learn the authentication key.
• MD5: Uses a key of up to 16 characters. Provides much stronger protection, as it does not include the authentication key in the packet. Instead, it provides a cryptographic hash based on the configured key. The MD5 algorithm creates a crypto checksum of an OSPF packet and an authentication key of up to 16 characters. The receiving router performs a calculation using the correct authentication key and discards the packet if the key does not match. In addition, a sequence number is maintained to prevent the replay of older packets.

set router‑id

	default

	ip_address

router‑id default

Selects the highest interface address when OSPF is enabled.

router‑id ip_address

Specifies a specific IP address to assign as the router ID. Do not use 0.0.0.0 as the router ID address. Check Point recommends setting the router ID rather than relying on the default setting. Setting the router ID prevents the ID from changing if the default interface used for the router ID goes down.

The Router ID uniquely identifies the router in the autonomous system. The router ID is used by the BGP and OSPF protocols. We recommend setting the router ID rather than relying on the default setting. This prevents the router ID from changing if the interface used for the router ID goes down. Use an address on a loopback interface that is not the loopback address (127.0.0.1). In a cluster, you must select a router ID and make sure that it is the same on all cluster members.

• Range: Dotted-quad.([0-255].[0-255].[0-255].[0-255]). Do not use 0.0.0.0
• Default: The interface address of one of the local interfaces.

set ospf

	rfc1583‑compatibility <on | off>

	spf‑delay <1‑60>

	spf‑delay default

	spf‑holdtime <1‑60>

	spf‑holdtime default

	default‑ase‑cost <1‑677215>

	default‑ase‑type <1 | 2>

	graceful-restart-helper <on | off>

rfc1583‑compatibility <on | off>

The Check Point implementation of OSPF is based on RFC 2178, which fixed some looping problems in an earlier specification of OSPF. If your implementation runs in an environment with OSPF implementations based on RFC 1583 or earlier, enable this option, which is on by default. Setting compatibility with RFC 1583 ensures backward compatibility.

on

spf‑delay <1‑60>

Specifies the time, in seconds, to wait before recalculating the OSPF routing table after a change in the topology.

spf‑delay default

Specifies an spf‑delay time of 2 seconds.

spf‑holdtime <1‑60>

Specifies the minimum time, in seconds, between recalculations of the OSPF routing table.

spf‑holdtime default

Specifies an spf‑holdtime of 5 seconds.

default‑ase‑cost <1‑6777215>

Specifies the cost assigned to routes from other protocols that are redistributed into OSPF as autonomous systems external. If the route has a cost already specified, that cost takes precedent.

1

default‑ase‑type <1 | 2>

Specifies the type assigned to routes from other protocols that are redistributed into OSPF as autonomous systems external. If the route has a type already specified, that type takes precedent.

1

graceful-restart-helper <on | off>

Specifies whether the Check Point system should maintain the forwarding state advertised by peer routers even when they restart to minimize the negative effects caused by peer routers restarting.

set ospf

	area <backbone | ospf_area> range ip_prefix <on | off>

	area <backbone | ospf_area> range ip_prefix restrict <on | off>

	stub‑network ip_prefix <on | off>

	stub‑network ip_prefix stub‑network‑cost <1‑677722>

set ospf interface if_name 

	area <backbone | ospf_area> <on | off>

	hello‑interval <1‑65535>

	hello‑interval default

	dead‑interval <1‑65535>

	dead‑interval default

	retransmit‑interval <1‑65535>

	retransmit‑interval default

	cost <1‑65535>

	priority <0‑255>

	passive <on | off>

	virtual-address <on | off>

	authtype none

	simple password

	md5 key authorization key id secret md5 secret

	md5 key authorization key id

area <backbone | ospf_area> range ip_prefix <on | off>

Select an area from the areas already configured.
Any area can be configured with any number of address ranges. These ranges are used to reduce the number of routing entries that a given area transmits to other areas. If a given prefix aggregates a number of more specific prefixes within an area, you can configure an address range that becomes the only prefix advertised to other areas. Be careful when configuring an address range that covers part of a prefix that is not contained within an area. An address range is defined by an IP prefix and a mask length. If you mark a range as restrict, it is not advertised to other areas.

area <backbone | ospf_area> range ip_prefix restrict <on | off>

Any area can be configured with any number of address ranges. These ranges are used to reduce the number of routing entries that a given area transmits to other areas. If a given prefix aggregates a number of more specific prefixes within an area, you can configure an address range that becomes the only prefix advertised to other areas. Be careful when configuring an address range that covers part of a prefix that is not contained within an area. An address range is defined by an IP prefix and a mask length. If you mark a range as restrict, it is not advertised to other areas.

stub‑network ip_prefix <on | off>

Specifies a stub network to which the specified interface range belongs. Configure a stub network to advertise reachability to prefixes that are not running OSPF. The advertised prefix appears as an OSPF internal route and is filtered at area borders with the OSPF area ranges. The prefix must be directly reachable on the router where the stub network is configured, that is, one of the router’s interface addresses must fall within the prefix range to be included in the router‑link‑state advertisement. Use a mask length of 32 to configure the stub host. The local address of a point‑to‑point interface can activate the advertised prefix and mask. To advertise reachability to such an address, enter an IP address for the prefix and a non‑zero cost for the prefix.

stub‑network ip_prefix stub‑network‑cost <1‑677722>

Configure a stub network to advertise reachability to prefixes that are not running OSPF. The advertised prefix appears as an OSPF internal route and is filtered at area borders with the OSPF area ranges. The prefix must be directly reachable on the router where the stub network is configured, that is, one of the router’s interface addresses must fall within the prefix range to be included in the router‑link‑state advertisement. Use a mask length of 32 to configure the stub host. The local address of a point‑to‑point interface can activate the advertised prefix and mask. To advertise reachability to such an address, enter an IP address for the prefix and a non‑zero cost for the prefix.

interface if_name area <backbone | ospf area> <on | off>

Specifies the OSPF area to which the specified interface belongs.

interface if_name hello‑interval <1‑65535>

Specifies the interval, in seconds, between hello packets that the router sends on the specified interface. For a given link, this value must be the same on all routers or adjacencies do not form.

interface if_name hello‑interval default

Specifies the default value for the hello interval, which is 10 seconds.

interface if_name dead‑interval <1‑65535>

Specifies the number of seconds after which a router stops receiving hello packets that it declares the peer down. Generally, you should set this value at 4 times the value of the hello interval. Do not set the value at 0. For a given link, this value must be the same on all routers or adjacencies do not form.

interface if_name dead‑interval default

Specifies the default value for the dead interval, which is 40 seconds

interface if_name retransmit‑interval <1‑65535>

Specifies the number of seconds between link state advertisement transmissions for adjacencies belonging to the specified interface. This value also applies to database description and link state request packets. Set this value conservatively, that is, at a significantly higher value than the expected round‑trip delay between any two routers on the attached network.

interface if_name retransmit‑interval default

Specifies the default for the retransmit interval, which is 5 seconds.

interface if_name cost <1‑65535>

Specifies the weight of the given path in a route. The higher the cost, the less preferred the link. To use one interface over another for routing paths, assign one a higher cost.

interface if_name priority <0‑255>

Specifies the priority for becoming the designated router (DR) on the specified link. When two routers attached to a network attempt to become a designated router, the one with the highest priority wins. This option prevents the DR from changing too often. The DR option applies only to a share‑media interface, such as Ethernet or FDDI; a DR is not elected on a point‑to‑point type interface. A router with a priority of 0 is not eligible to become the DR.

interface if_name passive <on | off>

Enabling this option puts the specified interface into passive mode; that is, hello packets are not sent from the interface. Putting an interface into passive mode means that no adjacencies are formed on the link. This mode enables the network associated with the specified interface to be included in intra‑area route calculation rather than redistributing the network into OSPF and having it function as an autonomous system external.

off

interface if_name authtype none

Specifies not to use an authentication scheme for the specified interface.

interface if_name authtype simple password

Specifies to use simple authentication for the specified interface. Enter an ASCII string that is 8 characters long. Generally, routers on a given link must agree on the authentication configuration to form peer adjacencies. Use an authentication scheme to guarantee that routing information is accepted only from trusted peers.

interface if_name authtype md5 key authorization key id secret md5 secret

Specifies to use MD5 authorization. Enter at least one key ID and its corresponding MD5 secret. If you configure multiple key IDs, the largest key ID is used for authenticating outgoing packets. All keys can be used to authenticate incoming packets. Generally, routers on a given link must agree on the authentication configuration to form peer adjacencies. Use an authentication scheme to guarantee that routing information is accepted only from trusted peers.

set ospf area backbone virtual‑link ip_address

 	transit‑area ospf_area <on | off>

	transit‑area ospf_area hello‑interval <1‑65535>

	transit‑area ospf_area hello‑interval default

	transit‑area ospf_area dead interval <1‑4294967295>

	transit‑area ospf_area dead interval default

	transit‑area ospf_area retransmit‑interval <1‑4294967295>

	transit‑area ospf_area retransmit‑interval default

	transit‑area ospf_area authtype none

	transit‑area ospf_area authtype simple password

	transit‑area ospf_area authtype md5 key authorization key id secret md5 key

	transit‑area ospf_area authtype md5 key authorization key id off

ip_address transit‑area ospf_area <on | off>

Specifies the IP address of the remote endpoint of the virtual link and transit area, which is a specified ospf area you configure using the set ospf area command. Configure the ospf area you are using as the transit area before you configure the virtual link. The transit area is the area shared by the border router on which you configure the virtual link and the router with an interface in the backbone area. Traffic between the endpoints of the virtual link flow through this area. The virtual link IP address functions as the router ID of the remote endpoint of the virtual link.

ip_address transit‑area ospf_area hello‑interval <1‑65535>

Specifies the interval, in seconds, between hello packets that the router sends on the specified interface. For a given link, this value must be the same on all routers or adjacencies do not form.

ip_address transit‑area ospf_area hello‑interval default

Specifies an interval of 10 seconds.

ip_address transit‑area ospf_area dead‑interval <1‑4294967295>

Specifies the number of seconds after which a router stops receiving hello packets that it declares the neighbor down. Generally, you should set this value at 4 times the value of the hello interval. Do not set the value at 0. For a given link, this value must be the same on all routers or adjacencies do not form.

ip_address transit‑area ospf_area dead‑interval default

Specifies a value of 40 seconds.

ip_address transit‑area ospf_area retransmit‑interval <1‑4294967295>

Specifies the number of seconds between link state advertisement transmissions for adjacencies belonging to the specified interface. This value also applies to database description and link state request packets. Set this value conservatively, that is, at a significantly higher value than the expected round‑trip delay between any two routers on the attached network.

ip_address transit‑area ospf_area retransmit‑interval default

Specifies a value of 5 seconds.

ip_address transit‑area ospf_area authtype none

Specifies not to use an authentication scheme for the specified interface.

ip_address transit‑area ospf_area authtype simple password

Specifies to use simple authentication for the specified interface. Enter an ASCII string that is 8 characters long. Generally, routers on a given link must agree on the authentication configuration to form neighbor adjacencies. Use an authentication scheme to guarantee that routing information is accepted only from trusted peers.

ip_address transit‑area ospf_area authtype md5 key authorization key id secret MD5 secret

Specifies to use MD5 authorization. Enter at least one key ID and its corresponding MD5 secret. If you configure multiple key IDs, the largest key ID is used for authenticating outgoing packets. All keys can be used to authenticate incoming packets. Generally, routers on a given link must agree on the authentication configuration to form neighbor adjacencies. Use an authentication scheme to guarantee that routing information is accepted only from trusted peers.

set ospf area backbone <on | off>

set ospf area ospf_area

	<on| off>

	stub <on | off>

	stub default‑cost <1‑677215>

	stub summary <on | off>

	nssa <on | off>

	nssa default-cost <1-677215>

	nssa default-metric-type <1-2>

	nssa import-summary-routes <on | off>

	nssa translator-role <always | candidate>

	nssa translator-stability-interval <1-65535>

	nssa redistribution <on |off>

	nssa range ip_addr [restrict] <on | off>

backbone <on | off>

Specifies whether to enable or disable the backbone area. By default, the backbone area is enabled. You can disable the backbone area if the system does not have interfaces on the backbone area.

<on | off>

Specifies the area ID for a new OSPF area. Check Point recommends that you enter the area ID as a dotted quad, but you can use any integer as the area ID. The area ID 0.0.0.0 is reserved for the backbone.

stub <on | off>

Specifies the area ID for a stub area. Stub areas are areas that do not have AS external routes.

Note: The backbone area cannot be a stub area.

stub default‑cost <1‑677215>

Specifies a default route into the stub area with the specified cost.

stub summary <on | off>

Specifies the OSPF area as totally stubby, meaning that it does not have any AS external routes and its area border routers do not advertise summary routes.

nssa <on | off>

Specifies the area ID for an NSSA.

Note: The backbone area cannot be an NSSA area.

nssa default-cost <1-677215>

Specifies the cost associated with the default route to the NSSA.

nssa default-metric-type <1-2>

Specifies the type of metric. The default, type 1, is equivalent to the Default ASE Route Type on the OSPF WebUI page. A type 1 route is internal and its metric can be used directly by OSPF for comparison. A type 2 route is external and its metric cannot be used for comparison directly.

nssa import-summary-routes <on | off>

Specifies if summary routes (summary link advertisements) are imported into the NSSA.

nssa translator-role <always | candidate>

Specifies whether this NSSA border router will unconditionally translate Type-7 LSAs into Type-5 LSAs. When role is Always, Type-7 LSAs are translated into Type-5 LSAs regardless of the translator state of other NSSA border routers. When role is Candidate, this router participates in the translator election to determine if it will perform the translations duties.

nssa translator-stability-interval <1-65535>

Specifies how long in seconds this elected Type-7 translator will continue to perform its translator duties once it has determined that its translator status has been assumed by another NSSA border router. Default: 40 seconds.

nssa redistribution <on |off>

Specifies if both Type-5 and Type-7 LSAs or only Type-7 LSAs will be originated by this NSSA border router.

nssa rangeip_addr[restrict] <on | off>

Specify the range of addresses to reduce the number of Type-5 LSAs for the NSSA border router. To prevent a specific prefix from being advertised, use the restrict argument.

show ospf

	neighbors

	neighbor ip_address

	interfaces

	interfaces stats

	interfaces detailed

	interface ifname

	interface ifname stats

	interface ifname detailed

	packets

	errors

	errors dd

	errors hello

	errors ip

	errors lsack

	errors lsr

	errors lsu

	errors protocol

	events

	border‑routers

	database

	database areas

	database area ospf_area

	database asbr‑summary-lsa

	database checksum

	database database‑summary

	database detailed

	database external-lsa

	database network-lsa

	database router-lsa

	database summary-lsa

	database type <1 | 2 | 3 | 4 |5 | 7> [detailed]

	database nssa-external-lsa [detailed]

	summary

neighbor ip_address

The priority, status, and number of errors logged for the specified IP address.

interface ifname <on | off>

The use of the VRRP virtual link-local address as the source of its control packets

interfaces

The names of all configured logical interfaces, their corresponding IP addresses, to area to which each interface is assigned, each interface’s status and the IP addresses of each logical interface’s designated router and backup designated router.

interfaces stats

The number of each type of error message logged for each OSPF interface as well as the number of link state advertisements sent by each interface.

interfaces detailed

Displays detailed information about each OSPF interface, including the authentication type configured if any, the router IDs and IP addresses of the designated router and backup designated router, the timer intervals configured for hello wait, dead, and retransmit messages, and the number of neighbors for each interface.

interface if_name

The IP address, area ID, status, number of errors logged, and the IP address of the designated router and backup designated router for the specified interface.

interface if_name stats

The number of each type of error message logged by the specified interface as well as the number of link‑state advertisements sent by the specified interface.

interface if_name detailed

Displays detailed information about the specified interface, including the authentication type configured if any, the router IDs and IP addresses of the designated router and backup designated router, the timer intervals configured for hello wait, dead, and retransmit messages, and the number of neighbors for each interface

packets

The number of each type of packet sent, including hello packets, link‑state update packets, and link‑state acknowledgment and link‑state request packets.

errors

The number of each type of error message sent, including hello protocol errors, database description errors, protocol errors, link‑state acknowledgment errors, link‑state request errors, link‑state update errors, and IP errors.

errors dd

The number of each type of database‑ description error messages only.

errors hello

The number of each type of hello‑ error message only.

errors ip

The number of each type of IP‑errors message only.

errors lsack

The number of each type of link‑state acknowledgment error message only.

errors lsu

The number of each type of link‑state update error message only

errors lsr

The number of each type of link‑state request error messages only.

errors protocol

The number of each type of protocol error message only.

border‑routers

The IP address of each area border router, the OSPF area of each border router, and the cost associated with each IP address.

database

Router‑link state and network‑link sate statistics for each OSPF area. Also The checksum, sequence number, and link count of each OSPF interface.

database areas

Router‑link state, network‑link state, AS‑border‑router link state, AS‑external link state, and summary‑link state statistics for each OSPF area. Also The checksum, sequence number, and link count of each OSPF interface.

database area ospf_area

Displays router‑link state, network‑link state, AS‑border‑router‑link state, AS‑ external‑link state, and summary‑link state statistics for the specified OSPF area. Also The checksum, sequence number, and link count of each IP address configured within the specified OSPF area.

database asbr‑summary

A summary of AS‑border‑router link state statistics for each OSPF area. For OSPFv2 only.

database external

Displays AS‑external‑link state statistics for each OSPF area.

database database‑summary

A summary of router‑link‑state, network‑link state, summary‑link‑state, and AS‑border‑router‑link state statistics.

database network

Network‑link‑state statistics, including the advertised router, sequence number, and checksum of each OSPF interface. For OSPFv2 only.

database nssa-external-lsa [detailed]

Type 7 LSAs (NSSA). This argument applies only to OSPF v2.

database router-lsa

Displays router‑link‑state statistics, including the advertised router, sequence number, checksum, and link count, of each OSPF interface. For OSPFv2 only.

database summary-lsa

A summary of link‑state statistics for each OSPF area. For OSPFv2 only.

database type <1 | 2 | 3 | 4 |5 | 7> [detailed]

Displays link‑state statistics associated with the specified number:

1—router‑link‑state statistics.

2—network‑link‑state statistics.

3—summary‑link‑state statistics.

4—AS‑border‑router‑link‑state statistics.

5—AS‑external‑link‑state statistics.

7—NSSA. This option applies only to OSPF v2.

events

The number of interface up/down events; virtual interface up/down events; designated router election events; router ID changes; area border router changes; AS border router changes, and link state advertisement messages.