[nsp] BGP routes received but not used

[Adam Kujawski]

Here's the basic BGP config:

router bgp 20205
  no synchronization
  network XXX.XXX.XXX.0 mask 255.255.254.0
  neighbor 65.207.235.181 remote-as 701
  neighbor 144.223.18.33 remote-as 1239
  no auto-summary
  !
  address-family ipv4 multicast
  neighbor 144.223.18.33 activate
  network XXX.XXX.XXX.0 mask 255.255.254.0
  exit-address-family
!

As far as I can tell, this seems to be the correct format for the "new" 
syntax. However, I did notice that when saving or copying the running 
config, I got an 'Address-family not configured' message. Is there 
something wrong with the above config outline?

I removed the ipv4 multicast address family and did a soft inbound reset on 
the neighbors and it didn't change anything - the routes were still not 
working. Oddly enough, adding the multicast address family back appears to 
have fixed the problem... or at least the routes that weren't working 
before are working now. I don't expect this to last... a reboot usually 
fixes the problem temporarily. It's acting pretty strange... I'm starting 
to think it is just an IOS error.

Thanks,
Adam




Thanks,
Adam





At 08:40 AM 11/4/2002, MPuras@solunet.com wrote:
>Hi.  Check that your next-hop for that route is in the routing table.  That
>you have added the "activate" key word after the multicast neighbor or
>unicast neighbor.  If this is supposed to be a route learned from your
>multicast enable peer, then check to make sure that your RPF table shows
>this route as being in there otherwise it will not place it into the routing
>table.  Can you post the " show ip bgp ipv4 multicast" commands for that
>route and perhaps the relevant bgp config?
>
>
>
>
>Thanks,
>
>Mario Puras
>SoluNet Technical Support
>Mailto: mpuras@solunet.com
>Direct: (321) 309-1410
>888.449.5766 (USA) / 888.SOLUNET (Canada)
>
>
>
>-----Original Message-----
>From: Adam Kujawski [mailto:adamkuj@amplex.net]
>Sent: Monday, November 04, 2002 1:06 AM
>To: cisco-nsp@puck.nether.net
>Subject: [nsp] BGP routes received but not used
>
>
>We have a 3660 running 12.2(4)T3 with 256 MB RAM. We are multihomed to two
>providers, and take full routes from both (about 113000 routes from each
>provider, according to 'show ip bgp sum'). We recently enabled MBGP with
>one of the upstreams. Since that time, we've had to add a default route to
>one of our providers, because routes received via BGP were not always being
>seen. It does not appear to be a memory problem - the router reports over
>130 MB of free RAM.
>
>'show ip route summary' gives the following:
>
>IP routing table name is Default-IP-Routing-Table(0)
>Route Source    Networks    Subnets     Overhead    Memory (bytes)
>connected       1           28          2056        4176
>static          4           30          2676        4896
>ospf 100        0           5           320         720
>    Intra-area: 3 Inter-area: 2 External-1: 0 External-2: 0
>    NSSA External-1: 0 NSSA External-2: 0
>bgp 20205       81508       30070       7140992     16230432
>    External: 111578 Internal: 0 Local: 0
>internal        1149                                1337436
>Total           82662       30133       7146044     17577660
>
>For example, www.cisco.com resolves to 198.133.219.25.
>
>'show ip bgp 198.133.219.25' gives the following:
>
>BGP routing table entry for 198.133.219.0/24, version 276733
>Paths: (2 available, best #2)
>    XXXX 109
>      XXX.XXX.XXX.XXX from XXX.XXX.XXX.XXX (XXX.XXX.XXX.XXX)
>        Origin IGP, metric 98, localpref 100, valid, external
>    XXXX 109
>      XXX.XXX.XXX.XXX from XXX.XXX.XXX.XXX (XXX.XXX.XXX.XXX)
>        Origin IGP, localpref 100, valid, external, best
>
>However, 'show ip route 198.133.219.25' gives the following:
>
>% Network not in table
>
>Without a default route, packets to 198.133.219.25 die at our router.
>
>Any ideas?
>
>Thanks,
>Adam
>
>
>
>
>
>       Adam Kujawski                      adamkuj@amplex.net
>       Network Administrator              Cell: 419.261.3268
>       Amplex Internet Services           Office: 419.720.3635
>
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      Adam Kujawski                      adamkuj@amplex.net
      Network Administrator              Cell: 419.261.3268
      Amplex Internet Services           Office: 419.720.3635