2-SSM and 4-SSM Deployment

These SSM deployments are available:

• 2 SSMs in a Chassis, with up to 12 Security Gateway Modules (SGMs).
• 4 SSM in a Chassis, which gives a much higher port density of SSM data ports. This deployment allows up to 10 SGMs in the Chassis. SSM60 and SGM220 are not supported.

SSM Port Density

	2 SSMs	4 SSMs	Configuration
Max 10GbE ports without splitter	14	28	10GbE ports act as 10GbE
Max 40GbE ports	4	8	40GbE ports act as 40GbE
Max 10GbE ports if using splitter	30	60	40GbE ports act as 4x10GbE
Max 1GbE ports	14	28	10GbE ports act as 1GbE

SGM Port Numbering in a 2-SSM Deployment

In a 2-SSM deployment, SGM slots are numbered 1 to 12, left to right. Slot 7 for example, (labeled [7] in the diagram) is the slot that is immediately to the right of the two Security Switch Module slots.

SGM Port Numbering in a 4-SSM Deployment

In a 4-SSM Deployment, SGM slots are numbered 1 to 10, left to right. Slot 6 for example, (labeled [6] in the diagram) is the slot that is immediately to the right of the four SSM slots.

SSM Management in a 4-SSM Deployment

In a 4-SSM deployment, the SSMs work independently. However, the Chassis management sees the SSMs as two pairs. An SSM pair has a Primary SSM and a Secondary SSM. The pairs are:

• Primary: SSM1. Secondary: SSM3
• Primary: SSM2. Secondary: SSM4

If a Primary SSM fails or is removed from the Chassis: The Chassis management sees the two SSMs as being Down, even though the Secondary SSM continues working.

If a Secondary SSM is removed or stops working: The management correctly sees the status of the two SSMs.