I can see tag information in a route learn from EBGP peer.Below information is an output from my test environment.
R2#sh ip route 192.168.30.0
Routing entry for 192.168.30.0/24
Known via "bgp 12", distance 20, metric 0
Tag 3, type external
Redistributing via ospf 1
Advertised by ospf 1 subnets
Last update from 192.168.23.3 00:01:35 ago
Routing Descriptor Blocks:
* 192.168.23.3, from 192.168.23.3, 00:01:35 ago
Route metric is 0, traffic share count is 1
AS Hops 1
Route tag 3
But when I have learnt BGP message format, I cann't find tag field in any BGP message. In view of this how does BGP transit tag information?
Thanks a lot
Martin
