Hi, Good catch. Showing CEF can help a lot.
Also Benny, you should check your RIB for how you are learning the 10.1.12.1/32 route. Kim On Feb 27, 2012, at 7:46 PM, Piotr Jablonski wrote: > Hi Benny, > > You have a recursive look up. Look at 10.1.12.0 in your cef. This is the > answer. This node is reachable via 10.1.14.1. You have a destination IP on > both nodes possibly. > > Rgds > > Pj > 27 lut 2012 14:54, "Benny Sumardy" <[email protected]> napisał(a): > >> >> Hi Guys, >> >> These are the output of : >> >> IGP (RIPv2 for connecting BGP links) : >> R4#sr | s router rip >> router rip >> version 2 >> network 10.0.0.0 >> no auto-summary >> R4# >> >> show ip bgp : >> >> >> R4#sib >> BGP table version is 8, local router ID is 4.4.4.4 >> 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 >> *> 1.0.0.0 10.1.14.1 0 400 0 100 i >> *>i2.0.0.0 10.1.23.2 0 100 0 i >> *>i3.0.0.0 10.1.34.3 0 100 0 i >> *> 4.0.0.0 0.0.0.0 0 32768 i >> * 11.0.0.0 10.1.14.1 0 0 100 i >> *>i 10.1.12.1 0 400 0 100 i >> R4# >> >> >> show ip route 11.1.1.1 & longer : >> >> R4#sir 11.1.1.1 >> Routing entry for 11.0.0.0/8 >> Known via "bgp 200", distance 200, metric 0 >> Tag 100, type internal >> Last update from 10.1.12.1 00:07:16 ago >> Routing Descriptor Blocks: >> * 10.1.12.1, from 10.1.23.2, 00:07:16 ago >> Route metric is 0, traffic share count is 1 >> AS Hops 1 >> Route tag 100 >> MPLS label: none >> R4#sir 11.1.1.1 longer >> Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP >> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area >> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 >> E1 - OSPF external type 1, E2 - OSPF external type 2 >> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 >> ia - IS-IS inter area, * - candidate default, U - per-user static >> route >> o - ODR, P - periodic downloaded static route, + - replicated route >> >> Gateway of last resort is not set >> >> B 11.0.0.0/8 [200/0] via 10.1.12.1, 00:07:32 >> R4# >> >> show ip cef : >> >> R4#sh ip cef >> Prefix Next Hop Interface >> 0.0.0.0/0 no route >> 0.0.0.0/8 drop >> 0.0.0.0/32 receive >> 1.0.0.0/8 10.1.14.1 Ethernet0/0 >> 2.0.0.0/8 10.1.34.3 Serial1/0.43 >> 3.0.0.0/8 10.1.34.3 Serial1/0.43 >> 4.0.0.0/8 attached Loopback0 >> 4.0.0.0/32 receive Loopback0 >> 4.4.4.4/32 receive Loopback0 >> 4.255.255.255/32 receive Loopback0 >> 10.1.12.0/24 10.1.14.1 Ethernet0/0 >> 10.1.12.1/32 10.1.14.1 Ethernet0/0 >> 10.1.14.0/24 attached Ethernet0/0 >> 10.1.14.0/32 receive Ethernet0/0 >> 10.1.14.1/32 attached Ethernet0/0 >> 10.1.14.4/32 receive Ethernet0/0 >> 10.1.14.255/32 receive Ethernet0/0 >> 10.1.23.0/24 10.1.34.3 Serial1/0.43 >> 10.1.23.2/32 10.1.34.3 Serial1/0.43 >> 10.1.34.0/24 attached Serial1/0.43 >> 10.1.34.0/32 receive Serial1/0.43 >> 10.1.34.3/32 10.1.34.3 Serial1/0.43 >> Prefix Next Hop Interface >> 10.1.34.4/32 receive Serial1/0.43 >> 10.1.34.255/32 receive Serial1/0.43 >> 11.0.0.0/8 10.1.14.1 Ethernet0/0 >> 127.0.0.0/8 drop >> 224.0.0.0/4 drop >> 224.0.0.0/24 receive >> 240.0.0.0/4 drop >> 255.255.255.255/32 receive >> R4# >> >> Traceroute : >> R4#trace 11.1.1.1 >> >> Type escape sequence to abort. >> Tracing the route to 11.1.1.1 >> >> 1 10.1.14.1 4 msec * 0 msec >> >> >> Did the sh ip route 11.1.1.1, it showed 10.1.12.1 as the next hop. But the >> cef listed the next hop to 10.1.14.1 (which is directly connected) rather >> than 10.1.12.1 (few hops away) as commanded by Local-Pref. >> Absurd, still try to find what's goin on ... Let me know if i still missed >> anything... >> >> >> Brgds >> Benny >> >> >> >>> Date: Mon, 27 Feb 2012 10:32:50 +0530 >>> From: [email protected] >>> To: [email protected] >>> CC: [email protected] >>> Subject: Re: [OSL | CCIE_RS] Local Preference issue. >>> >>> Yes, it would be more specific route directing traffic towards 14.1 as we >>> believe. Can you check routing table and CEF table for the below one. >>> >>> show ip route 11.1.1.1 >>> show ip cef .. >>> >>> venkee >>> >>> On 27 February 2012 00:26, Rob Pool <[email protected]> wrote: >>> >>>> If it had the same route in an igp an r would show up because the BGP >>>> route would prevent it from being inserted in the rib. However, a more >>>> specific route in an igp wouldn't prevent the less specific BGP route >> from >>>> being inserted. >>>> >>>> Sent from my iPhone >>>> >>>> On Feb 26, 2012, at 1:49 PM, <[email protected]> wrote: >>>> >>>>> If it had a more specific route from another protocol, wouldn't a "r" >>>> for "rib failure"show up for the route in the "sh ip bgp" command? >>>>> >>>>> Could an ICMP redirect from 10.1.12.1 is causing this? >>>>> >>>>> Doug >>>>> -------- Original Message -------- >>>>> Subject: Re: [OSL | CCIE_RS] Local Preference issue. >>>>> From: Rob Pool <[email protected]> >>>>> Date: Sun, February 26, 2012 10:41 am >>>>> To: Benny Sumardy <[email protected]> >>>>> Cc: CCIE ONLINE STUDY LIST <[email protected]> >>>>> >>>>> My guess would be that you have a more specific route being provided >> by >>>> an igp or static route. >>>>> >>>>> Sent from my iPhone >>>>> >>>>> On Feb 26, 2012, at 12:05 PM, Benny Sumardy <[email protected]> >>>> wrote: >>>>> >>>>>> >>>>>> Hi, >>>>>> >>>>>> Applied a local pref value for network 11.0.0.0 (as shown below), >> so >>>> the best route will prefer 10.1.12.1 (3 hops) than 10.1.14.1 (1 hop). >>>>>> But when I do a traceroute, the result still gone through >> 10.1.14.1. >>>> Can anybody help on what's missing here? Thanks >>>>>> >>>>>> Rgds >>>>>> Ben >>>>>> >>>>>> >>>>>> R4(config-router)#do sib >>>>>> BGP table version is 7, local router ID is 4.4.4.4 >>>>>> 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 >>>>>> *> 1.0.0.0 10.1.14.1 0 400 0 100 i >>>>>> *>i2.0.0.0 10.1.23.2 0 100 0 i >>>>>> *>i3.0.0.0 10.1.34.3 0 100 0 i >>>>>> *> 4.0.0.0 0.0.0.0 0 32768 i >>>>>> *>i11.0.0.0 10.1.12.1 0 400 0 100 i >>>>>> * 10.1.14.1 0 0 100 i >>>>>> R4(config-router)#do trace 11.1.1.1 >>>>>> >>>>>> Type escape sequence to abort. >>>>>> Tracing the route to 11.1.1.1 >>>>>> >>>>>> 1 10.1.14.1 12 msec * 0 msec >>>>>> R4(config-router)#do sir 11.0.0.0 >>>>>> Routing entry for 11.0.0.0/8 >>>>>> Known via "bgp 200", distance 200, metric 0 >>>>>> Tag 100, type internal >>>>>> Last update from 10.1.12.1 00:01:14 ago >>>>>> Routing Descriptor Blocks: >>>>>> * 10.1.12.1, from 10.1.23.2, 00:01:14 ago >>>>>> Route metric is 0, traffic share count is 1 >>>>>> AS Hops 1 >>>>>> Route tag 100 >>>>>> MPLS label: none >>>>>> R4(config-router)# >>>>>> R4(config-router)#do trace 11.1.1.1 >>>>>> >>>>>> Type escape sequence to abort. >>>>>> Tracing the route to 11.1.1.1 >>>>>> >>>>>> 1 10.1.14.1 4 msec * 4 msec >>>>>> R4(config-router)# >>>>>> >>>>>> _______________________________________________ >>>>>> For more information regarding industry leading CCIE Lab training, >>>> please visit www.ipexpert.com >>>>>> >>>>>> Are you a CCNP or CCIE and looking for a job? Check out >>>> www.PlatinumPlacement.com >>>>>> >>>>>> http://onlinestudylist.com/mailman/listinfo/ccie_rs >>>>> _______________________________________________ >>>>> For more information regarding industry leading CCIE Lab training, >>>> please visit www.ipexpert.com >>>>> >>>>> Are you a CCNP or CCIE and looking for a job? Check out >>>> www.PlatinumPlacement.com >>>>> >>>>> http://onlinestudylist.com/mailman/listinfo/ccie_rs >>>> _______________________________________________ >>>> For more information regarding industry leading CCIE Lab training, >> please >>>> visit www.ipexpert.com >>>> >>>> Are you a CCNP or CCIE and looking for a job? Check out >>>> www.PlatinumPlacement.com >>>> >>>> http://onlinestudylist.com/mailman/listinfo/ccie_rs >>>> >>> _______________________________________________ >>> For more information regarding industry leading CCIE Lab training, >> please visit www.ipexpert.com >>> >>> Are you a CCNP or CCIE and looking for a job? Check out >> www.PlatinumPlacement.com >>> >>> http://onlinestudylist.com/mailman/listinfo/ccie_rs >> >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> Are you a CCNP or CCIE and looking for a job? Check out >> www.PlatinumPlacement.com >> >> http://onlinestudylist.com/mailman/listinfo/ccie_rs >> > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs // Freedom Matters CCIE #29189 http://www.packet-forwarding.net _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
