Configuring Next_Hop Attributes For Routes - Huawei S6700 Series Configuration Manual

S6700 Series Ethernet Switches
Configuration Guide - IP Routing
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7.4.6 Configuring Next_Hop Attributes for Routes

Setting Next_Hop attributes for routes flexibly controls BGP route selection.
Procedure
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Issue 01 (2012-03-15)
1. Run:
system-view
The system view is displayed.
2. Run:
bgp as-number
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.
Configure a device to change the next-hop address of a route when the device advertises
the route to an IBGP peer.
By default, a device does not change the next-hop address of a route learned from an EBGP
peer before forwarding the route to IBGP peers. The next-hop address of a route advertised
by an EBGP peer to this device is the address of the EBGP peer. After being forwarded to
IBGP peers, this route cannot become an active route because the next hop is unreachable.
The relevant ASBR must be configured to change the next-hop address of the route to the
ASBR's own IP address before the ASBR advertises the route to an IBGP peer. The route
is active on the IBGP peer if the next hop is reachable.
1. Run:
system-view
The system view is displayed.
2. Run:
bgp as-number
The BGP view is displayed.
3. Run:
ipv4-family unicast
The IPv4 unicast address family view is displayed.
4. Run:
peer { ipv4-address | group-name } next-hop-local
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