Route Backup; Route Recursion; Route Redistribution; Displaying And Maintaining A Routing Table - HP 3600 v2 series Configuration Manual

NOTE:
At present, routing protocols supporting load sharing include static routing/IPv6 static routing, RIP/RIPng,
OSPF/OSPFv3, BGP/IPv6 BGP, and IS-IS/IPv6 IS-IS.

Route backup

Route backup can help improve network reliability. With route backup, you can configure multiple routes
to the same destination, expecting the one with the highest preference to be the main route and all the
rest backup routes.
Under normal circumstances, packets are forwarded through the main route. When the link fails, the
route with the highest preference among the backup routes is selected to forward packets. When the link
recovers, the route selection process is performed again and the main route is selected again to forward
packets.

Route recursion

The next hops of some BGP routes (except eBGP routes) and static routes may not be directly connected.
The outgoing interface to reach the next hop must be available. Route recursion is used to find the
outgoing interface based on the next hop information of the route. Link-state routing protocols, such as
OSPF and IS-IS, do not need route recursion because they obtain next hop information through route
calculation.

Route redistribution

Different routing protocols running on a network learn route information from each other through route
redistribution. Each routing protocol can redistribute routes from other protocols, direct routes, and static
routes. For more information, see relevant protocols in this configuration guide.

Displaying and maintaining a routing table

To do...
Display information about the
routing table
Display information about routes
permitted by an IPv4 basic ACL
Display information about routes to
the specified destination
Display information about routes
with destination addresses in the
specified range
Use the command...
display ip routing-table [ vpn-instance
vpn-instance-name ] [ verbose ] [ | { begin
| exclude | include } regular-expression ]
display ip routing-table [ vpn-instance
vpn-instance-name ] acl acl-number
[ verbose ] [ | { begin | exclude |
include } regular-expression ]
display ip routing-table [ vpn-instance
vpn-instance-name ] ip-address [ mask |
mask-length ] [ longer-match ] [ verbose ]
[ | { begin | exclude | include }
regular-expression ]
display ip routing-table [ vpn-instance
vpn-instance-name ] ip-address1 { mask |
mask-length } ip-address2 { mask |
mask-length } [ verbose ] [ | { begin |
exclude | include } regular-expression ]
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Remarks
Available in any view
Available in any view
Available in any view
Available in any view