You are very welcome.
-- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert Mailto: markom_at_ipexpert.com Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Web: http://www.ipexpert.com/ On Mon, Mar 15, 2010 at 20:17, <Charles.Henson_at_regions.com> wrote: > That is what I needed to hear. So the commands make sense. I am filtering > it (by now allowing it specifically) in a prefix list I have applied > inbound to my BGP. I have found the problem. > > THANKS MARKO! > > Charles Henson > > > > > |------------> > | From: B B B | > |------------> > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > B |Marko Milivojevic <markom_at_ipexpert.com> B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B | > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > |------------> > | To: B B B B | > |------------> > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > B |Charles.Henson_at_regions.com B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B | > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > |------------> > | Cc: B B B B | > |------------> > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > B |ccielab_at_groupstudy.com B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B | > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > |------------> > | Date: B B B | > |------------> > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > B |03/15/2010 03:12 PM B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B | > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > |------------> > | Subject: B | > |------------> > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > B |Re: OT - BGP command output interpretation B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B | > B >--------------------------------------------------------------------------------------------------------------------------------------------------| > > > > > > Hi, > > The command "sh ip bgp nei x.x.x.x received-routes" will show you > prefixes BEFORE they pass through your inbound filters. Do you see > prefix with "sh ip bgp nei x.x.x.x routes". If not, you need to look > at your inbound filtering. > > -- > Marko Milivojevic - CCIE #18427 > Senior Technical Instructor - IPexpert > > Mailto: markom_at_ipexpert.com > Telephone: +1.810.326.1444 > Fax: +1.810.454.0130 > Web: http://www.ipexpert.com/ > > On Mon, Mar 15, 2010 at 19:59, B <Charles.Henson_at_regions.com> wrote: >> Well... kinda OT..... So I'm troubleshooting some BGP and putting my > study >> skills to good work and having a bit of an issue. >> >> PROBLEM: >> B B B B B B B Router has no 0/0 route. Router is supposed to get 0/0 from > BGP peer. >> Then OSPF on same router (via default information originate) will feed it >> on to WAN. No "always" applied to OSPF Default information originate >> statement. >> >> x.x.x.y is my upstream provider. z.z.z.z is my IBGP peer for redundancy. > I >> see that it is not feeding me any prefixes. Normally I have 1 prefix (the >> 0/0 route) and that is all I need. So the way I'm reading the below >> statement, it looks to me like I'm not being fed any route(s). So if that >> is the case than the below output looks logical and I need to go yell at > my >> carrier. >> > ############################################################################################### > >> ROUTER-1#show ip bgp summ >> BGP router identifier x.x.x.x, local AS number 9999 >> BGP table version is 38, main routing table version 38 >> 5 network entries using 585 bytes of memory >> 9 path entries using 468 bytes of memory >> 6/2 BGP path/bestpath attribute entries using 744 bytes of memory >> 1 BGP AS-PATH entries using 24 bytes of memory >> 0 BGP route-map cache entries using 0 bytes of memory >> 0 BGP filter-list cache entries using 0 bytes of memory >> BGP using 1821 total bytes of memory >> 1 received paths for inbound soft reconfiguration >> BGP activity 9/4 prefixes, 42/33 paths, scan interval 60 secs >> >> Neighbor B B B B B B B V B B B AS MsgRcvd MsgSent B B TblVer B InQ OutQ > Up/Down >> State/PfxRcd >> x.x.x.y B B B 4 B 1234 B 137818 B 137857 B B B B B B 38 B B B 0 B B B 0 > 01:52:26 B B B B B B B 0 >> z.z.z.z B B B 4 9999 B 137867 B 137858 B B B B B B 38 B B B 0 B B B 0 00:01:14 > B B B B B B B 4 >> >> ROUTER-1#show ip bgp >> BGP table version is 38, local router ID is x.x.x.x >> Status codes: s suppressed, d damped, h history, * valid, > best, i - >> internal, >> B B B B B B B B B B B B B r RIB-failure, S Stale >> Origin codes: i - IGP, e - EGP, ? - incomplete >> >> [NO 0/0 ROUTE. NOTHING TO SEE HERE. MOVE ALONG] >> B B Network B B B B B B B B B Next Hop B B B B B B B B B B B Metric LocPrf Weight > Path >> >> >> > ############################################################################################### > >> >> BUT WAIT. WHAT IS THIS? >> >> If I hit up my specific neighbor for received routes then BGP reports > that >> it has a 0/0 route from his peer. It's total prefix count is 1. Met and >> local pref 0. That all looks good. The route is valid. But it is not >> flagged as "best". >> > ################################################################################################ > >> ROUTER-1#show ip bgp neighbors B B x.x.x.y received-routes >> BGP table version is 38, local router ID is x.x.x.x >> Status codes: s suppressed, d damped, h history, * valid, > best, i - >> internal, >> B B B B B B B B B B B B B r RIB-failure, S Stale >> Origin codes: i - IGP, e - EGP, ? - incomplete >> >> B B Network B B B B B B B B B Next Hop B B B B B B B B B B B Metric LocPrf Weight > Path >> * B 0.0.0.0 B B B B B B B B B x.x.x.y B B B B B B B B B B B B 0 B B B B B B B B B B B B 0 > 1234 i >> >> Total number of prefixes 1 >> > ################################################################################################ > >> >> So my BGP summary commands sho zero prefixes being received by me. But my >> neighbor specific command shows the 0/0 being received and the prefixes >> totalling 1. This is my problem. The 0/0 route appears there but it's not >> getting passed to the RIB. Now I have no other static or dynamic 0/0 > routes >> or anything else with a lower AD. I have no RIB failures. >> >> 1. Am I understanding the command output above correctly? I believe that > I >> am based on CCO and checking with my local Cisco guy. He's nosing around > as >> well but feels that something is amiss here. >> >> 2. If I (we) are interpreting the command output above correctly, then > does >> the conflict between the commands make sense? Any thoughts? >> >> I have bounced the router and still have the same issue. To bring things > up >> I have added a static to to see if that would work. It did. So the next > hop >> is valid. Anyone? >> >> [IP addressing and ASNs have been changed to protect the innocent. Yes, I >> am aware that some creative googling will reveal all anyway.] >> >> >> Charles Henson >> >> >> Blogs and organic groups at http://www.ccie.net >> >> _______________________________________________________________________ >> Subscription information may be found at: >> http://www.groupstudy.com/list/CCIELab.html > > > Blogs and organic groups at http://www.ccie.net > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html Blogs and organic groups at http://www.ccie.netReceived on Mon Mar 15 2010 - 20:31:46 ART
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