Re: BGP Routing problem

[Danny McPherson <danny () genuity net>]

i believe (received-only) means that bgp soft-reconfiguration is configured 
for the peer and since some policy is denying the route, it won't be used .. 
unless a policy change occurs.

here's what we're currently hearing from you folks...

peer1.sjc1#sh ip bgp re 6180
BGP table version is 2830358, local router ID is 207.240.24.10
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop          Metric LocPrf Weight Path
* i196.6.121.0      192.41.177.248        10     80      0 701 5713 6180 i
* i                 198.32.176.2          10     80      0 701 5713 6180 i
*>                  198.32.184.42         10     80      0 701 5713 6180 i
* i196.28.5.0       192.41.177.248        10     80      0 701 5713 6180 i
* i                 198.32.176.2          10     80      0 701 5713 6180 i
*>                  198.32.184.42         10     80      0 701 5713 6180 i
 h 206.49.228.0     198.32.184.42         10     80      0 701 5713 6180 i
* i                 192.41.177.243        10     80      0 4000 6187 6180 i
* i                 192.157.69.80         10     80      0 4000 6187 6180 i
*>                  198.32.136.94         10     80      0 4000 6187 6180 i
* i206.49.229.0     192.41.177.243        10     80      0 4000 6187 6180 i
* i                 192.157.69.80         10     80      0 4000 6187 6180 i
*>                  198.32.136.94         10     80      0 4000 6187 6180 i

and it appears as though routing via alternet is working for the networks you 
mentioned.

-danny

> Hi
>
> We are a ISP in South Africa and have a problem we are trying to 
> figure out rather urgently, without much success so far.
>
> We are currently multi-homed during the day and tripple homed at
> night. (our peaks are at night and we get cheap bandwidth from
> another ISP who has their peak in the day). Internic has refused to
> give us our own block of addresses which would have made thins much
> simpler. (despite repeated attempts, and we now have 7 /24's from
> various places and badly need more).
>
> Basicaly we (AS6180) have been announcing all our adresses including
> 196.25.116.0, 196.25.117.0 and 196.25.203.0 via AS 3741 at night,
> and this gets switched of during the day. The problem seems to relate
> to the fact that these addresses are part of AS 5713's CIDR 
> 196.25.0.0/16 and we thought we could get away with announcing them 
> like this. It did work fine for over a week, but now today we have a 
> problem.
>
> MAE-East (see example at end of message) ,  the Sprintnap and who
> knows who else still have entries for these via AS3741 but they are
> showing as received-only, and no best path. Yet via MAE West they are
> fine. 
>
> We are going to stop announcing these via AS3741 at night, but its 
> been 9 hours now since they were not announced and these 
> received-only entries are still sitting there blocking these routes 
> from it seems about a third of the internet.
>
> Can any one offer any comments on why they are still there, what 
> received-only means and how we can get if fixed?
>
> Many thanks
> Regards
> Anthony Walker
>
>
> MAE-East Looking Glass Results
> Query: bgp 
> Addr: 196.25.203.0 
> BGP routing table entry for 196.25.203.0/24, version 5006458
> Paths: (1 available, no best path, advertised over IBGP)
>   1673 1239 4005 3741 6180, (received-only)
>     192.41.177.141 from 192.41.177.141 (140.223.57.217)
>       Origin IGP, external