Hi all,
this could be interesting to a lof ot M-series users: The number of BGP Routes
in the global Table is still growing. M-series user should know that all
M-series (at least M5,M10,M7i,M10i) have only 8MB of SRAM/SSRAM in their FIB
which can hold up to ~550k unique routes no matter how much memory your
Routingengine or DRAM (replaceable) the FIB has.
Currently i only know about a enhanced SSB for M20 which is available and has
16MB so this limit will not be reached in the near future but all other (older)
models only have 8MB (fixed on the board, not replacable!) and there are no
upgrades available (as far as i know).
Example for a M10 Router with RE-3.0 (only 50% mem used):
> start shell
> vty fib
# show jtree 0 memory
Memory Statistics:
8388608 bytes total (4 banks)
7980272 bytes used
408336 bytes free
8128 pages total
7884 pages used
244 pages free
31 max freelist size
As you see there is already 95% used.
The SRAM/SSRAM is needed for packet forwarding so i think if it's full you have
a blackhole-like routing (so the router will eat the packets for prefixes that
didn't fit in the memory).
We are currently replacing all M-series by MX-series since there is no other
way (unless you dont have a BGP fulltable).
I just wanted to share this info before many people run into problems because
of the memory.
HTH,
Kind regards,
Joerg
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