R0106-HP MSR Router Series Layer 3 - IP Routing Configuration Guide(V7)

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Ste
p
Command Remarks
2. Enter BGP IPv4 unicast address
family view, BGP-VPN IPv4
unicast address family view, or
BGP IPv4 multicast address
family view.
• Enter BGP IPv4 unicast address
family view:
a. bgp as-number
b. address-family ipv4
[ unicast ]
• Enter BGP-VPN IPv4 unicast
address family view:
c. bgp as-number
d. ip vpn-instance
vpn-instance-name
e. address-family ipv4
[ unicast ]
• Enter BGP IPv4 multicast
address family view:
f. bgp as-number
g. address-family ipv4
multicast
N/A
3. Enable MED comparison for
routes on a per-AS basis.
bestroute compare-med By default, this feature is disabled.
To enable MED comparison for routes on a per-AS basis (IPv6 unicast/multicast address family):
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP IPv6 unicast address
family view, or BGP IPv6
multicast address family view.
• Enter BGP IPv6 unicast address
family view:
a. bgp as-number
b. address-family ipv6
[ unicast ]
• Enter BGP IPv6 multicast
address family view:
c. bgp as-number
d. address-family ipv6
multicast
N/A
3. Enable MED comparison for
routes on a per-AS basis.
bestroute compare-med By default, this feature is disabled.
Enabling MED comparison for routes from confederation peers
This task enables BGP to compare the MEDs of routes received from confederation peers. However, if a
route received from a confederation peer has an AS number that does not belong to the confederation,
BGP does not compare the route with other routes. For example, a confederation has three AS numbers
65006, 65007, and 65009. BGP receives three routes from different confederation peers. The AS_PATH
attributes of these routes are 65006 65009, 65007 65009, and 65008 65009, and the MED values of
them are 2, 3, and 1. Because the third route's AS_PATH attribute contains AS number 65008 that does
not belong to the confederation, BGP does not compare it with other routes. As a result, the first route
becomes the optimal route.
To enable MED comparison for routes from confederation peers (IPv4 unicast/multicast address family):