Huawei Quidway NetEngine80E Configuration Manual page 792

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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Issue 02 (2014-09-30)
2. Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
3. Run:
ipv4-family unicast
The IPv4 unicast address family view is displayed.
4. Run:
deterministic-med
The deterministic-MED function is enabled.
If the deterministic-MED function is not enabled and an optimal route is to be selected
among routes that are received from different ASs and carry the same prefix, the
sequence in which routes are received is relevant to the route selection result. After
the deterministic-MED function is enabled and an optimal route is to be selected
among routes that are received from different ASs and carry the same prefix, routes
are first grouped based on the leftmost AS number in the AS_Path attribute. Routes
with the same leftmost AS number are grouped together and compared, and an optimal
route is selected in the group. The optimal route in this group is then compared with
the optimal routes from other groups to determine the final optimal route. This route
selection mode allows the route selection result to be independent of the sequence in
which routes are received.
Configure the method used by BGP to handle the situation where a route has no MED
attribute during route selection.
1. Run:
system-view
The system view is displayed.
2. Run:
bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
3. Run:
ipv4-family unicast
The IPv4 unicast address family view is displayed.
4. Run:
bestroute med-none-as-maximum
The system treats a BGP route as one with the maximum MED value if the route has
no MED value.
After the bestroute med-none-as-maximum command is run, BGP treats a BGP
route as one with the maximum MED value if the route that has no MED attribute
when selecting an optimal route. If this command is not run, BGP uses 0 as the MED
value for a route that has no MED value.
Compare the MED values of routes in a confederation.
1. Run:
system-view
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8 BGP Configuration
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