Thanks ventre, my concern is , in R3 table, prefix is learned from 13.1(R1), but in cef, it shows as towards sw1, (37.7).
--Venkee On 2 February 2012 22:27, Ventre Alessandro <[email protected]> wrote: > It depends, to clear the cef table > At first impact i think it is a tipical loop. > You receive 150.1.6.0/24 from bgp internal, > exactly 155.1.146.6, from 155.1.13.1 perhaps 13.1 is a RR > 146.6 in bgp internal admin 200 is the peering address for the neighbor > the route is learned from, thus neighbor 146.6 under bgp > if you want reach this prefix probabily you nedd a recursive lookup > until a outgoing interface is found, in this case is successfull > because is installed in bgp and rib table. also ibgp route cannot > adertised to another ibgp peer > > rather have you got a mutual redistribution also in bgp? thus from bgp > in igp ( match community set tag with community list) > you should verify hop by hop > > You do follow commands > sh ip ei in > sh ip prot > sg bg ipv4 u > sh ip ro > to each router > > > > On Thu, Feb 2, 2012, at 07:53 PM, Venkee wrote: > > Thanks Marc > > > > On R3, i have captured the following, > > > > Rack1R3(config-router)#do sh ip route 150.1.6.6 > > Routing entry for 150.1.6.0/24 > > Known via "bgp 100", distance 200, metric 0, type internal > > Redistributing via eigrp 100 > > Advertised by eigrp 100 metric 1500 1 255 1 1500 > > Last update from 155.1.146.6 00:18:27 ago > > Routing Descriptor Blocks: > > * 155.1.146.6, from 155.1.13.1, 00:18:27 ago > > Route metric is 0, traffic share count is 1 > > AS Hops 0 > > MPLS label: none > > Rack1R3(config-router)# > > Rack1R3(config-router)#do 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 > > 127.0.0.0/8 drop > > 150.1.0.0/16 155.1.37.7 Ethernet0/0 > > 150.1.3.0/24 attached Loopback0 > > 150.1.3.0/32 receive Loopback0 > > 150.1.3.3/32 receive Loopback0 > > 150.1.3.255/32 receive Loopback0 > > 150.1.6.0/24 155.1.37.7 Ethernet0/0 > > > > As per RIB, the next hop shows the 155.1.13.1, but in CEF, 155.1.37.7 as > > next hop, so i think i need to clear the cef table > > > > Please correct if i am wrong > > > > --Venkee > > > > On 2 February 2012 18:19, marc abel <[email protected]> wrote: > > > > > You need to look at the route on the router 155.1.37.7. It is pointing > > > back to R3 for some reason. > > > > > > On Thu, Feb 2, 2012 at 12:54 AM, Venkee <[email protected]> wrote: > > > > > >> Guys, > > >> > > >> While making the setup, i noticed the routing loop, may i know the > reason > > >> why ? please help > > >> > > >> Rack1R5#trace 150.1.6.6 > > >> > > >> Type escape sequence to abort. > > >> Tracing the route to 150.1.6.6 > > >> > > >> 1 155.1.0.3 16 msec 20 msec 20 msec > > >> 2 155.1.37.7 20 msec 20 msec 20 msec > > >> 3 155.1.37.3 20 msec 20 msec 20 msec > > >> 4 155.1.37.7 20 msec 24 msec 20 msec > > >> 5 155.1.37.3 20 msec 20 msec 16 msec > > >> 6 155.1.37.7 20 msec 20 msec 20 msec > > >> 7 155.1.37.3 20 msec 20 msec 20 msec > > >> 8 155.1.37.7 20 msec 20 msec 20 msec > > >> 9 155.1.37.3 20 msec 20 msec 20 msec > > >> 10 155.1.37.7 20 msec 20 msec 20 msec > > >> 11 155.1.37.3 16 msec 20 msec 16 msec > > >> 12 155.1.37.7 20 msec 20 msec 20 msec > > >> 13 155.1.37.3 20 msec 20 msec 20 msec > > >> 14 155.1.37.7 20 msec 24 msec 20 msec > > >> 15 155.1.37.3 16 msec 20 msec 20 msec > > >> 16 155.1.37.7 20 msec 20 msec 20 msec > > >> 17 155.1.37.3 20 msec 20 msec 20 msec > > >> 18 155.1.37.7 20 msec 20 msec 20 msec > > >> 19 155.1.37.3 20 msec 16 msec 20 msec > > >> 20 155.1.37.7 20 msec 20 msec 20 msec > > >> > > >> Rack1R3(config-router)#do sh ip route 150.1.6.6 > > >> Routing entry for 150.1.6.0/24 > > >> Known via "bgp 100", distance 200, metric 0, type internal > > >> Redistributing via eigrp 100 > > >> Advertised by eigrp 100 metric 1500 1 255 1 1500 > > >> Last update from 155.1.146.6 00:18:27 ago > > >> Routing Descriptor Blocks: > > >> * 155.1.146.6, from 155.1.13.1, 00:18:27 ago > > >> Route metric is 0, traffic share count is 1 > > >> AS Hops 0 > > >> MPLS label: none > > >> Rack1R3(config-router)# > > >> Rack1R3(config-router)#do 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 > > >> 127.0.0.0/8 drop > > >> 150.1.0.0/16 155.1.37.7 Ethernet0/0 > > >> 150.1.3.0/24 attached Loopback0 > > >> 150.1.3.0/32 receive Loopback0 > > >> 150.1.3.3/32 receive Loopback0 > > >> 150.1.3.255/32 receive Loopback0 > > >> 150.1.6.0/24 155.1.37.7 Ethernet0/0 > > >> 155.1.0.0/16 155.1.37.7 Ethernet0/0 > > >> 155.1.0.0/24 attached Serial1/0.1 > > >> 155.1.0.0/32 receive Serial1/0.1 > > >> 155.1.0.3/32 receive Serial1/0.1 > > >> 155.1.0.255/32 receive Serial1/0.1 > > >> 155.1.5.0/24 155.1.0.5 Serial1/0.1 > > >> 155.1.7.0/24 155.1.37.7 Ethernet0/0 > > >> 155.1.8.0/24 155.1.0.5 Serial1/0.1 > > >> 155.1.9.0/24 155.1.37.7 Ethernet0/0 > > >> 155.1.10.0/24 155.1.0.5 Serial1/0.1 > > >> 155.1.13.0/24 attached Serial1/2 > > >> 155.1.13.0/32 receive Serial1/2 > > >> > > >> Rack1R3(config-router)#do sh ip cef 150.1.6.0 > > >> 150.1.6.0/24 > > >> nexthop 155.1.37.7 Ethernet0/0 > > >> > > >> do i need to clear the > > >> > > >> Regards, > > >> Venkee > > >> _______________________________________________ > > >> 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 > > > -- > This message is intended for the individual(s) to whom it is addressed and > may contain information that is privileged or confidential. > If you are not the addressee you must not read,use or disclose the > contents of this email. > Whilst all reasonable care has been taken to avoid the transmission of > viruses, the recipient should carry out virus and other checks, > as they consider appropriate. > Myself accepts no responsibility in this regard. > > Ventre Alessandro > > > _______________________________________________ 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
