On Tue, 30 Apr 2019 at 15:04, <[email protected]> wrote: > > So for the ASR920, you get about 20,000 FIB entries. That's what you want > to > > keep your eye on to determine whether you're at a point where you need to > > do this. > > > > Ideally, you would be carrying IGP and LDP in FIB. With BGP-SD, you can > > control the number of routes you want in FIB. > > > Also with OSPF prefix-suppression you can reduce the OSPF footprint to mere > loopbacks (i.e. excluding all p2p links).
Originally, I was in support of prefix-suppression however, Cisco implemented it on IOS and IOS-XE devices for OSPF and not ISIS, and not for either OSPF or ISIS on IOS-XR. Later they implemented it on IOS-XR devices but for ISIS only and not OSPF. Another Cisco fail at aligning their own features across their own products. So, since it can't even be deployed in an all Cisco network, let alone a typical multi-vendor network I just don't use it anymore. Having said that, it does work, this is an example on IOS using prefix-suppression for OSPF: https://null.53bits.co.uk/index.php?page=ospf-inter-area-filtering IS-IS on Cisco has a method that exist to only advertise the loopback interface in the LSDB for IOS/XE and IOS-XR however, they are two different methods. IOS: router isis advertise passive-only passive-interface Loopback0 IOS-XR: router isis interface x/y suppressed I've got lots of notes on OSPF and IS-IS scaling in a mixed Juniper/Cisco environment but they're very much in draft format, I can try and make them presentable if I get some free time / and there is demand. Cheers, James. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
