IP-Link in the Policy-based Routing Environment
This section describes the IP-link in the policy-based
routing environment.
PBR cannot sense the reachability of the links of the next hop
and default next hop. When the link of the next hop or default next
hop is unreachable and the device adopts the settings of the next
hop or the default next hop for packet forwarding, the packet forwarding
may fail.
Interworking PBR with IP-link solves the previous problem and improves
the flexibility of PBR applications and the dynamic network environment
sensation of PBR. When you configure IP-link, ensure that the destination
IP address of the monitored link is consistent with the specified
next hop or default next hop of PBR and associate policy-based routes
with IP-link. IP-link monitors the reachability of the links of the
next hop and default next hop and dynamically determines the availability
of policy-based routes by IP-link state.
- When an IP link is Up, the link is reachable, and PBR is valid
to guide traffic forwarding.
- When an IP link is Down, the link is unreachable,
and PBR is invalid. Packets are forwarded based on the routing table.