[ dragansar @ 03.11.2012. 11:45 ] @
U svrhu prirema za "CCIP BGP 642-661" radim jedan lab u GNS3, odakle i naziv teme...i naisao sam na jedan problem...evo topologije: Par rutera u nekoliko razlicitih BGP AS-tema, na svakom ruteru objavljene mreze na interfejsima Lo1 i Lo2 Trenutno R2 nije peers sa R7, svi ostali izmedju sebe jesu + u AS 807 R6 je peers sa R7 R8 i R9 (kao sto crvene strelice pokazuju) Sve je podeseno i radi kako treba sem jednog problema na ruteru R9...naime: Kada pingam ruter R2 sa R9 ne moze! Ne samo ruter R2 nego bilo koji drugi...(ali sad cu se u primjeru vezati samo sa R2) R9#ping 26.50.40.1 source 96.50.40.1 Citat: Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 26.50.40.1, timeout is 2 seconds: Packet sent with a source address of 96.50.40.1 ..... Success rate is 0 percent (0/5) Na R9 rute prema R2 su best i validne R9#show ip bgp Citat: BGP table version is 13, local router ID is 96.50.50.1 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 *>i26.50.40.0/24 6.6.6.6 0 100 0 654 133 205 500 i *>i26.50.50.0/24 6.6.6.6 0 100 0 654 133 205 500 i *>i46.50.40.0/24 6.6.6.6 0 100 0 654 133 i *>i46.50.50.0/24 6.6.6.6 0 100 0 654 133 i *>i56.50.40.0/24 6.6.6.6 0 100 0 654 i *>i56.50.50.0/24 6.6.6.6 0 100 0 654 i *>i66.50.40.0/24 6.6.6.6 0 100 0 i *>i66.50.50.0/24 6.6.6.6 0 100 0 i *>i91.191.57.0/24 6.6.6.6 0 100 0 654 133 205 i *>i91.192.57.0/24 6.6.6.6 0 100 0 654 133 205 i *> 96.50.40.0/24 0.0.0.0 0 32768 i *> 96.50.50.0/24 0.0.0.0 0 32768 i Nex hop adresa je dostupna i rute prema R2 se naravno nalaze u ruting tabeli R9#ping 6.6.6.6 Citat: Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 64/92/132 ms Na ruterima R7 i R8 radi sve bez problema, pa predpostavljam da je problem na relaciji izmedju R6 i R9...jer nisu direktno povezani Neighbors izmedju njih je ok R9#show ip bgp summary Citat: BGP router identifier 96.50.50.1, local AS number 807 BGP table version is 13, main routing table version 13 12 network entries using 1404 bytes of memory 12 path entries using 624 bytes of memory 7/6 BGP path/bestpath attribute entries using 868 bytes of memory 4 BGP AS-PATH entries using 96 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 2992 total bytes of memory BGP activity 12/0 prefixes, 12/0 paths, scan interval 60 secs Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 6.6.6.6 4 807 39 35 13 0 0 00:31:56 10 Sinhronizacija je iskljucena R9#show run | s bgp Citat: router bgp 807 no synchronization bgp log-neighbor-changes network 96.50.40.0 mask 255.255.255.0 network 96.50.50.0 mask 255.255.255.0 neighbor 6.6.6.6 remote-as 807 neighbor 6.6.6.6 description peers_R6 neighbor 6.6.6.6 update-source Loopback0 no auto-summary Stanje i na R6 R6#show run | s bgp Citat: router bgp 807 no synchronization bgp log-neighbor-changes network 66.50.40.0 mask 255.255.255.0 network 66.50.50.0 mask 255.255.255.0 neighbor 5.5.5.5 remote-as 654 neighbor 5.5.5.5 description peeers_R5 neighbor 5.5.5.5 ebgp-multihop 2 neighbor 5.5.5.5 update-source Loopback0 neighbor 7.7.7.7 remote-as 807 neighbor 7.7.7.7 description peers_R7 neighbor 7.7.7.7 ebgp-multihop 5 neighbor 7.7.7.7 update-source Loopback0 neighbor 7.7.7.7 next-hop-self neighbor 8.8.8.8 remote-as 807 neighbor 8.8.8.8 description peers_R8 neighbor 8.8.8.8 ebgp-multihop 5 neighbor 8.8.8.8 update-source Loopback0 neighbor 8.8.8.8 next-hop-self neighbor 9.9.9.9 remote-as 807 neighbor 9.9.9.9 description peers_R9 neighbor 9.9.9.9 ebgp-multihop 5 neighbor 9.9.9.9 update-source Loopback0 neighbor 9.9.9.9 next-hop-self no auto-summary Ruter R2 vidi ispravno rute na R9 R2#show ip bgp Citat: BGP table version is 17, local router ID is 26.50.50.1 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 *> 26.50.40.0/24 0.0.0.0 0 32768 i *> 26.50.50.0/24 0.0.0.0 0 32768 i *> 46.50.40.0/24 10.0.0.13 0 205 133 i *> 46.50.50.0/24 10.0.0.13 0 205 133 i *> 56.50.40.0/24 10.0.0.13 0 205 133 654 i *> 56.50.50.0/24 10.0.0.13 0 205 133 654 i *> 66.50.40.0/24 10.0.0.13 0 205 133 654 807 i *> 66.50.50.0/24 10.0.0.13 0 205 133 654 807 i *> 76.50.40.0/24 10.0.0.13 0 205 133 654 807 i *> 76.50.50.0/24 10.0.0.13 0 205 133 654 807 i *> 86.50.40.0/24 10.0.0.13 0 205 133 654 807 i *> 86.50.50.0/24 10.0.0.13 0 205 133 654 807 i *> 91.191.57.0/24 10.0.0.13 0 0 205 i *> 91.192.57.0/24 10.0.0.13 0 0 205 i *> 96.50.40.0/24 10.0.0.13 0 205 133 654 807 i *> 96.50.50.0/24 10.0.0.13 0 205 133 654 807 i Uradim traceroute sa R9 R9#traceroute 26.50.40.1 source 96.50.40.1 Citat: Type escape sequence to abort. Tracing the route to 26.50.40.1 1 * * * 2 * * * Pinga sa R2 prema R9 R2#traceroute 96.50.40.1 source 26.50.40.1 Citat: Type escape sequence to abort. Tracing the route to 96.50.40.1 1 10.0.0.13 48 msec 148 msec 32 msec 2 10.0.0.9 192 msec 68 msec 76 msec 3 10.0.0.5 172 msec 100 msec 120 msec 4 10.0.0.1 180 msec 196 msec 116 msec 5 192.168.0.2 292 msec 212 msec 284 msec 6 192.168.0.2 !H * !H Vidim da ruter R6 pravi problem! i na njemu: R6#ping 96.50.40.1 source 66.50.40.1 Citat: Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 96.50.40.1, timeout is 2 seconds: Packet sent with a source address of 66.50.40.1 U.U.U Success rate is 0 percent (0/5) R6#traceroute 96.50.40.1 source 66.50.40.1 Citat: Type escape sequence to abort. Tracing the route to 96.50.40.1 1 192.168.0.13 68 msec 192.168.0.2 100 msec 192.168.0.13 16 msec 2 192.168.0.2 !H 192.168.0.13 !H * Pitanje? Sta je pogresno u setup-u ili samom dizajnu? [Ovu poruku je menjao dragansar dana 03.11.2012. u 12:56 GMT+1] [Ovu poruku je menjao dragansar dana 03.11.2012. u 13:03 GMT+1] |