Riverstone Networks WICT1-12 - Manual (Page 299)

Riverstone Networks RS Switch Router User Guide Release 8.0 16-41
BGP Configuration Guide BGP Configuration Examples
On R11, the same route is prepended with the sub-AS (64706) to which R10 belongs:
Note that R11, while in a different sub-AS, is in the same confederation as R10. Within a confederation, routers can
“see” other sub-AS’s and the sub-AS numbers appear in curly braces ({}) in the path display.
On R13, which is not part of the confederation, the as-path now shows only the AS number of the confederation:
Note As shown in the example outputs for R9 and R11, the next hop, local pref and
MED values are passed unchanged through routers in the confederation. The
peer-group configuration must include the
multihop
parameter so that the next
hop value is passed through the routers. In the above BGP confederation example,
the
multihop
parameter should be specified for R11.
r11# bgp show routes all
BGP table : Local router ID is 186.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
------- -------- ------ ------ ----
*>3/8 172.16.220.2 50 1000 {64706}64901 64751 6379 1 701 80 i
172.16.224/24 172.16.224.2 100 i
* 172.16.225/24 172.16.224.2 100 i
r13# bgp show routes all
BGP table : Local router ID is 13.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
------- -------- ------ ------ ----
*>3/8 172.16.225.1 64705 64901 64751 6379 1 701 80 i