[f-nsp] BigIron RX FIB Capacity

[Josh Farrelly]

Hi

If you exhaust the max ip-route count the router will simply reject any additional entries to the route table.

We experienced an issue with the default values when we implemented our NetIron CER, we would receive a full table from one provider, only half of what another was sending us an any manual "ip route" commands added after the fact would end up in configuration but not in the routing table.

We bumped this value up significantly and all our issues were solved. That is assuming of course that the hardware platform in question can allocate the memory for this to happen.

Regards,

Josh Farrelly.

-----Original Message-----
From: foundry-nsp [mailto:foundry-nsp-bounces at puck.nether.net] On Behalf Of Joeri Vanthienen
Sent: Monday, 3 March, 2014 9:06 a.m.
To: foundry-nsp at puck.nether.net
Subject: [f-nsp] BigIron RX FIB Capacity

Hi all,

We have some BigIron RX routers configured with the maximum FIB capacity values:

system-max ip-cache 524288
system-max ip-route 524288


What will exactly happen if we reach the limit on this platform? Will the router insert some kind of default entry to punt lookup exceptions to software? Do you get some kind of cache trashing? Are the oldest entries swapped by newer, or shorter prefixes removed in favor of more specific prefixes ?
In the future we will need to combine BGP prefix filters with a default route to overcome the limitations of this platform, but I'm just very curious how Brocade has implemented this :) Is RIB -> FIB filtering implemented (or on the roadmap) for the newer MLX and CER platforms?

Thanks in advance.
Joeri
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