Getting pretty close to default IPv4 route maximum for 6500/7600 routers.

Jeff Kell jeff-kell at
Tue May 6 16:30:58 UTC 2014

On 5/6/2014 11:39 AM, Drew Weaver wrote:
> Hi all,
> I am wondering if maybe we should make some kind of concerted effort to remind folks about the IPv4 routing table inching closer and closer to the 512K route mark.
> We are at about 94/95% right now of 512K.
> For most of us, the 512K route mark is arbitrary but for a lot of folks who may still be running 6500/7600 or other routers which are by default configured to crash and burn after 512K routes; it may be a valuable public service.

Yes, a Sup720/PFC3CXL defaults to 512K IPv4 routes, and reconfiguring
the FIB requires a reload.  So I've been quietly expecting a somewhat
serious meltdown when we hit 512K :)


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