3Com MSR 50, MSR 30 manual Default-route imported BGP/BGP-VPN instance view, 963

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View BGP view/BGP-VPN instance view

Parameters med-value: Default MED value, in the range 0 to 4294967295.

Description Use the default med command to specify a default MED value.

Use the undo default med command to restore the default.

By default, the default med-valueis 0.

Multi-exit discriminator (MED) is an external metric for routes. Different from local preference, MED is exchanged between ASs and will stay in the AS once it enters the AS. The route with a lower MED is preferred. When a router running BGP obtains several routes with an identical destination but different next-hops from various external peers, it will select the best route depending on the MED value. In the case that all other conditions are the same, the system first selects the route with the smallest MED as the best external route.

Examples # In BGP view, configure the default MED as 25.

<Sysname> system-view

[Sysname] bgp 100

[Sysname-bgp] default med 25

#In BGP-VPN instance view, configure the default MED as 25 (the VPN has been created).

<Sysname> system-view [Sysname] bgp 100

[Sysname-bgp] ipv4-family vpn-instance vpn1 [Sysname-bgp-vpn1] default med 25

default-route imported (BGP/BGP-VPN instance view)

Syntax default-route imported

undo default-route imported

View BGP view/BGP-VPN instance view

Parameters None

Description Use the default-route imported command to allow default route redistribution into the BGP routing table.

Use the undo default-route imported command to disallow the redistribution.

By default, default route redistribution is not allowed.

Using the default-route imported command cannot redistribute default routes.

To do so, use the import-routecommand.