I don't have the lab in front of me, so forgive the off-the-wall questions. Is 110.99.50.5 the ethernet address to the peer you're talking with? And you're saying the routes don't disapear right away! Remember, it's a TCP session. And there are keepalives. And like most things you have a miss a few keepalives in a row to detect the down state. And the database walker works every 60 seconds. So things aren't always immediate. Look at things like "fallover" and "graceful-restart" and other NSF-related commands if you want quicker reaction. Otherwise, you're correct all routes to an eBGP (NON-Confederation) peer should have their own IP as next hop unless there's a route-map manipulating that information. Confederation peers, even though technically eBGP, play by iBGP-'ish rules. HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al. CCSI/JNCI-M/JNCI-ER VP - Technical Training - IPexpert, Inc. IPexpert Sr. Technical Instructor [EMAIL PROTECTED] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 http://www.ipexpert.com _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Morris, Jason L. Sent: Monday, April 21, 2008 10:50 AM To: [email protected] Subject: [OSL | CCIE_RS] Lab 22 BGP config Ok maybe I'm missing something, having a brain fart or just plain don't know what I'm looking at but I'm getting some 'unexpected' output from R7 in Lab 22 when I do a 'sho ip bgp'. I've pasted the output below. If I do a 'sho ip bgp nei neighbor adv' (I believe) I should see all routes advertised to me from that neighbor, right? And if that neighbor is an eBGP peer all the 'next hop' information should be the neighbor's address, right? I found this because if I go in and shut R5's Ethernet interface I still have routes with a next hop of 110.99.50.5 (sorry I guess you'd have to be familiar with the lab to answer the question) I have the config at the time of this output saved for all routers so if you need to see something I can paste it in. Any help or clarification would be greatly appreciated. R7(config)# do sho ip bgp BGP table version is 26, local router ID is 110.90.7.7 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path * 110.90.1.1/32 110.99.50.5 0 112 111 i *> 110.99.50.5 0 112 111 i * 110.90.2.2/32 110.99.50.6 0 112 i *> 110.99.50.5 0 112 i * 110.90.4.4/32 110.99.50.6 0 112 i *> 110.99.50.5 0 112 i * 110.90.5.5/32 110.99.50.5 0 112 i *> 110.99.50.5 0 0 112 i * 110.90.6.6/32 110.99.50.6 0 0 112 i *> 110.99.50.6 0 112 i *> 110.90.7.7/32 0.0.0.0 0 32768 i r>i110.90.8.8/32 110.90.8.8 0 100 0 i * 110.99.1.0/27 110.99.50.6 0 112 i *> 110.99.50.5 0 112 i * 110.99.1.32/27 110.99.50.5 0 112 i *> 110.99.50.5 0 0 112 i * 110.99.1.64/27 110.99.50.6 0 0 112 i Network Next Hop Metric LocPrf Weight Path *> 110.99.50.6 0 112 i r>i110.99.4.0/24 110.90.8.8 0 100 0 i * 110.99.12.0/24 110.99.50.5 0 112 111 i *> 110.99.50.5 0 112 111 i * 110.99.25.0/26 110.99.50.5 0 112 i *> 110.99.50.5 0 0 112 i * 110.99.40.0/24 110.99.50.6 0 112 i *> 110.99.50.5 0 112 i *> 110.99.50.0/24 0.0.0.0 0 32768 i * 110.99.50.6 0 0 112 i * 110.99.50.5 0 0 112 i * 110.99.69.0/30 110.99.50.6 0 0 112 i *> 110.99.50.6 0 112 i *> 110.99.78.0/24 0.0.0.0 0 32768 i * i 110.90.8.8 0 100 0 i * 150.50.200.0/24 110.99.50.5 0 112 111 i *> 110.99.50.5 0 112 111 i * 172.16.4.0/24 110.99.50.5 0 112 111 i *> 110.99.50.5 0 112 111 i R7(config)#do sho ip bgp nei 110.99.50.6 adv BGP table version is 26, local router ID is 110.90.7.7 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 110.90.1.1/32 110.99.50.5 0 112 111 i *> 110.90.2.2/32 110.99.50.5 0 112 i *> 110.90.4.4/32 110.99.50.5 0 112 i *> 110.90.5.5/32 110.99.50.5 0 0 112 i *> 110.90.6.6/32 110.99.50.6 0 112 i *> 110.90.7.7/32 0.0.0.0 0 32768 i r>i110.90.8.8/32 110.90.8.8 0 100 0 i *> 110.99.1.0/27 110.99.50.5 0 112 i *> 110.99.1.32/27 110.99.50.5 0 0 112 i *> 110.99.1.64/27 110.99.50.6 0 112 i r>i110.99.4.0/24 110.90.8.8 0 100 0 i *> 110.99.12.0/24 110.99.50.5 0 112 111 i *> 110.99.25.0/26 110.99.50.5 0 0 112 i *> 110.99.40.0/24 110.99.50.5 0 112 i *> 110.99.50.0/24 0.0.0.0 0 32768 i *> 110.99.69.0/30 110.99.50.6 0 112 i *> 110.99.78.0/24 0.0.0.0 0 32768 i Network Next Hop Metric LocPrf Weight Path *> 150.50.200.0/24 110.99.50.5 0 112 111 i *> 172.16.4.0/24 110.99.50.5 0 112 111 i Total number of prefixes 19 R7(config)#do sho ip bgp nei 110.99.50.5 adv BGP table version is 26, local router ID is 110.90.7.7 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 110.90.1.1/32 110.99.50.5 0 112 111 i *> 110.90.2.2/32 110.99.50.5 0 112 i *> 110.90.4.4/32 110.99.50.5 0 112 i *> 110.90.5.5/32 110.99.50.5 0 0 112 i *> 110.90.6.6/32 110.99.50.6 0 112 i *> 110.90.7.7/32 0.0.0.0 0 32768 i r>i110.90.8.8/32 110.90.8.8 0 100 0 i *> 110.99.1.0/27 110.99.50.5 0 112 i *> 110.99.1.32/27 110.99.50.5 0 0 112 i *> 110.99.1.64/27 110.99.50.6 0 112 i r>i110.99.4.0/24 110.90.8.8 0 100 0 i *> 110.99.12.0/24 110.99.50.5 0 112 111 i *> 110.99.25.0/26 110.99.50.5 0 0 112 i *> 110.99.40.0/24 110.99.50.5 0 112 i *> 110.99.50.0/24 0.0.0.0 0 32768 i *> 110.99.69.0/30 110.99.50.6 0 112 i *> 110.99.78.0/24 0.0.0.0 0 32768 i Network Next Hop Metric LocPrf Weight Path *> 150.50.200.0/24 110.99.50.5 0 112 111 i *> 172.16.4.0/24 110.99.50.5 0 112 111 i Total number of prefixes 19 Jason Morris
