Route advertised to all LAN sites except one

Answered Question

Hi

I added a static route (10.96.0.0 255.255.0.0 10.21.1.8) to one of our LAN sites and then advertised it out via BGP. All sites on the network can now access this new route except for one. Any ideas what the issue could be? See below some tests from various sites

london_01#ping 10.96.22.4 source 10.2.2.15

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.96.22.4, timeout is 2 seconds:
Packet sent with a source address of 10.2.2.15
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/13/16 ms

london_01#

leeds_01#ping 10.96.22.4 source 10.10.2.15

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.96.22.4, timeout is 2 seconds:
Packet sent with a source address of 10.10.2.15
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/15/16 ms
leeds_01#ping 10.96.22.3 source 10.10.2.15

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.96.22.3, timeout is 2 seconds:
Packet sent with a source address of 10.10.2.15
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/14/16 ms

but

kingsgate_01#ping 10.96.22.4 source 10.24.2.15

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.96.22.4, timeout is 2 seconds:
Packet sent with a source address of 10.24.2.15
.....
Success rate is 0 percent (0/5)
kingsgate_01#ping 10.22.2.15

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.22.2.15, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/12/12 ms
kingsgate_01#ping 10.96.22.3 source 10.24.2.15

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.96.22.3, timeout is 2 seconds:
Packet sent with a source address of 10.24.2.15
.....
Success rate is 0 percent (0/5)
kingsgate_01#traceroute 10.96.22.4

Type escape sequence to abort.
Tracing the route to 10.96.22.4

  1 172.23x.xxx.xxx 4 msec 4 msec 4 msec
  2 81.1xxx.xxx.xxx [AS 64522] 12 msec 8 msec 12 msec
  3 172.25x.xxx.xxx [AS 2856] 16 msec 12 msec 16 msec
  4  *  *  *

kingsgate_01#sh ip rou 10.96.22.4
Routing entry for 10.96.0.0/16
  Known via "bgp 64528", distance 20, metric 0
  Tag 2856, type external
  Last update from 172.xxx.xxx.xxx 15:19:45 ago
  Routing Descriptor Blocks:
  * 172.xxx.xxx.xxx, from 172.xxx.xxx.xxx, 15:19:45 ago
      Route metric is 0, traffic share count is 1
      AS Hops 2
      Route tag 2856

kingsgate_01#sh ip rou 10.22.1.8
Routing entry for 10.22.0.0/17
  Known via "bgp 64528", distance 20, metric 0
  Tag 2856, type external
  Last update from 172.2xx.xxx.xxx 1d13h ago
  Routing Descriptor Blocks:
  * 172.xxx.xxx.xxx, from 172.xxx.xxx.xxx, 1d13h ago
      Route metric is 0, traffic share count is 1
      AS Hops 2
      Route tag 2856

kingsgate_01#sh ip rou 10.96.22.3
Routing entry for 10.96.0.0/16
  Known via "bgp 64528", distance 20, metric 0
  Tag 2856, type external
  Last update from 172.xxx.xxx.xxx 15:20:31 ago
  Routing Descriptor Blocks:
  * 172.xxx.xxx.xxx, from 172.xxx.xxx.xxx, 15:20:31 ago
      Route metric is 0, traffic share count is 1
      AS Hops 2
      Route tag 2856

I have this problem too.
0 votes
Correct Answer by milan.kulik about 6 years 5 months ago

Hi,

isn't it possible the remote site doesn't know a route back to  kingsgate_01?

Have you tried to traceroute from  10.96.22.4 to 10.24.2.15?

HTH,

Milan

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Correct Answer
milan.kulik Wed, 08/04/2010 - 06:58

Hi,

isn't it possible the remote site doesn't know a route back to  kingsgate_01?

Have you tried to traceroute from  10.96.22.4 to 10.24.2.15?

HTH,

Milan

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