Cisco 2921 maximum Number of L3 Ethernet Ports

[brunnerthomas]

I am currios about one thing with the Cisco 29xx routers.

How many routed ethernet ports do they support when using HWIC-1FE and HWIC-2FE modules?

On the Cisco site for the two interface modules and in the corrseponding PDF of supported interfaces for 29xx routers a maximum number of 2 2port modules(HWIC-2FE) and 2 1port modules(HWIC-2FE) is written.

Does this mean, that I can put in 4 L3 HWIC modules into one Cisco 2921 router by combining these two HWIC modules resulting in a total number of 7 interfaces for this router?

Best regards,

Thomas

[paolo bevilacqua]

What matters is not how may interfaces you can stuff in a router,

You have to consider the router performances to handle a given traffic. For examplem a 2901 might not, a 2951 might do.

[brunnerthomas]

Well in our case it is not likely that we will reach the maximum routing performance of the 2921. The main purpose of this router is to connect systems like an NTP Server, Syslog-Server, datalinks which will be transmitted over 64kbit links, etc... to five different LANs.

The peak bandwith will be lower than ~100mbit.

[iskoy.istem]

2921 i think can support up to 4 EHWIC/HWIC modules. The available high density routed (L3) HWIC module is HWIC-2FE (2 L3 Interface). So 4 HWIC slot multiply to 2 FE equal to 8 L3 interface via HWIC modules plus the built-in 3 Gigabit L3 Interfaces which makes it to a maximum of 11 L3/Router interfaces.