On 6/10/14, 10:15 AM, Łukasz Bromirski wrote: > Hi Blake, > > On 10 Jun 2014, at 19:04, Blake Hudson <bl...@ispn.net> wrote: > >> In this case, does the 512k limit of the 6500/7600 refer to the RIB or the >> FIB? And does it even matter since the BGP prefix table can automatically be >> reduced to ~300k routes? > > Te 512k limit refers to FIB in the B/C (base) versions of 6500/7600 > Supervisors and DFCs (for line cards). BXL/CXL versions have FIB for > 1M IPv4 prefixes. > > You can find more information here: > > http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/117712-problemsolution-cat6500-00.html > > And yes, you’re right - no matter how many neighbors you have, the FIB > will only contain best paths, so it will be closer to 500k entries in > total rather than N times number of neighbours.
Until you add multi-as multipath and addpath and a couple VRFs and all of sudden FIB budget blows up.
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