[c-nsp] eBGP & backup static route

[Timothy Arnold]

Hi All,

I’ve got a site with an ADSL connection, and an ISDN backup terminating in to a VRF. I am running an eBGP session across the ADSL link to advertise the local subnet.

#show ip route vrf XXX 10.101.0.0
Routing entry for 10.101.0.0/16
  Known via "bgp 20547", distance 20, metric 0
  Tag 65101, type external
  Last update from 172.31.255.2 00:00:03 ago
  Routing Descriptor Blocks:
  * 172.31.255.2, from 172.31.255.2, 00:00:03 ago
      Route metric is 0, traffic share count is 1
      AS Hops 1

That works great. When the backup kicks in, radius inserts a framed route

#show ip route vrf XXX 10.101.0.0
Routing entry for 10.101.0.0/16
  Known via "static", distance 250, metric 0
  Redistributing via bgp 20547
  Advertised by bgp 20547
  Routing Descriptor Blocks:
  * 172.31.255.10
      Route metric is 0, traffic share count is 1

That works great too.

The issue I have is that it the static route is not replaced by the eBGP learned route when the ADSL returns, even though the distance is lower? It is only replaced when the backup link is terminated.

Any ideas?

Thanks
Tim



Timothy Arnold
Senior Engineer, Network & Security Group, UKSolutions

Telephone: 0845 004 1333, option 2
Email: timothy.arnold at uksolutions.co.uk
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