Route Recursion; Route Redistribution; Displaying And Maintaining A Routing Table - HP MSR2000 series Configuration Manual

The router forwards matching packets through the main route. When the main route fails, the route with
the highest preference among the backup routes is selected to forward packets. When the main route
recovers, the router uses it to forward packets.

Route recursion

To use a BGP route, static route (that is configured with a next hop but with no output interface), or RIP
route that has an indirectly-connected next hop, a router must perform route recursion to find the outgoing
interface to reach the next hop.
Link-state routing protocols, such as OSPF and IS-IS, do not need route recursion, because they obtain
directly-connected next hops through route calculation.

Route redistribution

Route redistribution enables routing protocols to learn route information from each other. A dynamic
routing protocol can redistribute routes from other protocols including direct routes and static routes. For
more information, see the respective chapters on those routing protocols in this configuration guide.

Displaying and maintaining a routing table

Task
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.
Display routing information
permitted by an IPv4 prefix list.
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 ]
display ip routing-table [ vpn-instance
vpn-instance-name ] ip-prefix
ip-prefix-name [ verbose ] [ | { begin |
exclude | include } regular-expression ]
4
Remarks
Available in any view
Available in any view
Available in any view
Available in any view
Available in any view