Hi, at least for Sup720-3B(XL) and Sup-2T it results in number 1 for the family that hit the limit.
So in most cases it will look that way: #show mls cef exception status Current IPv4 FIB exception state = TRUE Current IPv6 FIB exception state = FALSE Current MPLS FIB exception state = FALSE And yes, the box will drop down to a few MBit of Traffic. kind regards Rolf > Hi, > > 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. > > But a have a couple of questions. > > I have been hearing different scenario of what would happen when the > TCAM is full: > 1. The whole thing goes into software routing mode for all routes which > causes 100% CPU and resulting and unusable box > 2. New route entries will just get dropped, current entries just stay in > TCAM > 3. New route entries will be software routed, but entries that are > already in TCAM will be hardware routed. You won't notice much impact in > the beginning. > > What is true? > > The only reason that our 7606 needs to be replaces it because of the > TCAM. It doesn't do much traffic, like 3Gbps upstream. Only BGP/OSPF. > And not many ports, 8 x 10Gb fiber + 30 x 1Gb copper (local servers). > > We will probably go for the ASR9006. But I would like to use it like I'm > using the 7600 now, as a router/switch. I have been reading that you > need to make some uncommon config to create Ethernet VLAN/Trunk > interfaces and ports, as this is not commonly not done with this router. > But is this good practice? Will it be fine once I fingered it out? > > Last question. Can I take a full BGP feed on both v4 and v6 with a > A9K-RSP440-TR? Or do I need the -SE? > > Chiel > > > > Bellow are some output of our current 7600: > > #show mls cef maximum-route >  IPv4 + MPLS        - 832k (default) >  IPv6               - 90k >  IP Multicast       - 1k > > #show mls cef su > Total routes:                    915422 >    IPv4 unicast routes:         822144 >    IPv4 Multicast routes:       8 >    MPLS routes:                 2050 >    IPv6 unicast routes:         91220 >    IPv6 multicast routes:       3 >    EoM routes:                  0 > > #show mls cef exception status > Current IPv4 FIB exception state = FALSE > Current IPv6 FIB exception state = FALSE > Current MPLS FIB exception state = FALSE > > #show platform hardware capacity forwarding > L3 Forwarding Resources >  Module             FIB TCAM usage: Total       > Used    %Used >   2                    72 bits (IPv4, MPLS, > EoM)     851968 > 824115    97% >                        144 bits (IP mcast, > IPv6)      98304 91198    93% > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
