bgp backdoor issue

[Vinayaka Raman]

The prefix 100.179.12.0/24 is learnt on tap via eBGP and eigrp..

i have set bgp backdoor command so that IGP wins over BGP

But it looks like even after hard reset, isn't working. can someone explain if i miss something here?

tap#show run | s r bgp

router bgp 65457

no synchronization

bgp log-neighbor-changes

network 100.179.10.0 mask 255.255.255.0

network 100.179.11.0 mask 255.255.255.0

network 100.179.12.0 backdoor

neighbor 10.0.0.2 remote-as 65457

neighbor 10.0.0.2 shutdown

neighbor 11.1.1.2 remote-as 65000

no auto-summary

tap#show ip bgp 100.179.12.0

BGP routing table entry for 100.179.12.0/24, version 5

Paths: (1 available, best #1, table Default-IP-Routing-Table)

  Not advertised to any peer

  65000 65458

    11.1.1.2 from 11.1.1.2 (152.0.0.1)

      Origin IGP, localpref 100, valid, external, best

tap#show ip route 100.179.12.0

Routing entry for 100.179.12.0/24

  Known via "bgp 65457", distance 20, metric 0

  Tag 65000, type external

  Last update from 11.1.1.2 00:05:15 ago

  Routing Descriptor Blocks:

  * 11.1.1.2, from 11.1.1.2, 00:05:15 ago

      Route metric is 0, traffic share count is 1

      AS Hops 2

      Route tag 65000

tap#show ip ei top 100.179.12.0/24

IP-EIGRP (AS 1): Topology entry for 100.179.12.0/24

  State is Passive, Query origin flag is 1, 0 Successor(s), FD is 4294967295

  Routing Descriptor Blocks:

  10.0.0.2 (Serial0/0), from 10.0.0.2, Send flag is 0x0

      Composite metric is (2297856/128256), Route is Internal

      Vector metric:

        Minimum bandwidth is 1544 Kbit

        Total delay is 25000 microseconds

        Reliability is 255/255

        Load is 1/255

        Minimum MTU is 1500

        Hop count is 1

tap#

[Vinayaka Raman]

is this the problem with mask?

[blau grana]

yes, it will be problem with mask. If you do not set mask, BGP thinks classful so network 100.179.12.0 backdoor means:

network 100.179.12.0 mask 255.0.0.0 backdoor which to no match 100.179.12.0/24.

[mahmoodmkl]

Hi

Can u incule mask in the backdoor command and try.

Thanks

[Ajay Raj]

Since you have not added ask in backdoor command. It will consider ar /8 and there will be no effecte in that.

Give the command network 100.179.12.0 mask 255.255.255.0 backdoor