18.09.2020 15:54, chiel wrote:
> I'm currently using a 7606 (RSP720RSP-3CXL) and taking in full BGP on v4 and
> v6.
> Obviously it the TCAM is almost full and the box needs to be replaced.
I use same router with two copies of full BGP on v4 and v6.
There is a way to mitigate the problem without replacing the box.
The following configuration places a filter on routes being installed
from BGP RIB to TCAM (FIB) limiting its usage by length of AS-PATH,
so traffic to very distant networks goes via default route.
This way, "show platform hardware capacity" shows:
Module FIB TCAM usage: Total Used
%Used
5 72 bits (IPv4, MPLS, EoM) 884736 422247
48%
144 bits (IP mcast, IPv6) 81920 8412
10%
Works fine for me.
mls cef maximum-routes ip 850
mls cef maximum-routes mpls 1
router bgp NNNN
address-family ipv4
table-map BGP2FIB filter
address-family ipv6
table-map BGP6FIB filter
!
route-map BGP2FIB permit 10
match as-path 400
!
route-map BGP2FIB permit 20
match ip address prefix-list SELECTED-SET
!
route-map BGP6FIB permit 10
match as-path 500
!
ip as-path access-list 400 deny ^.+_.+_.+_.+
ip as-path access-list 400 deny ^.+_65535$
ip as-path access-list 400 permit ^.*
ip as-path access-list 500 deny ^.+_.+_.+
ip as-path access-list 500 deny ^.+_65535$
ip as-path access-list 500 permit ^.*
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