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Configuring Routing 551
The OSPF Route Redistribution Summary page contains the following fields:
•
Source
— The Source Route to be redistributed by OSPF.
•
Redistribute
— Specify whether to allow the routes learned through this protocol to be redistributed.
•
Metric
— The Metric of redistributed routes for the given Source Route. Displays 0 when not
configured.
•
Metric Type
— The OSPF metric type of redistributed routes.
•
Tag
— The tag field in routes redistributed. This field displays the tag value if the source was
preconfigured, otherwise 0 is displayed.
•
Subnets
— Specify whether the subnetted routes should be redistributed (
Enable
) or not (
Disable
).
•
Distribute List
— The access list that filters the routes to be redistributed by the destination protocol.
Displays 0 when not configured.
•
Redistribute
— Redistribute among other VLANs in the domain.
Displaying the Route Redistribution Summary Using CLI Commands
For information about the CLI command that performs this function, see the following chapter in the
CLI Reference Guide:
• OSPF Commands
The following table summarizes the equivalent CLI commands for this feature.
Nonstop Forwarding OSPF Graceful Restart
The OSPF protocol can be configured to perform a “graceful restart” in conjunction with the nonstop
forwarding feature (see "Nonstop Forwarding" on page 258) for stacked switches. When OSPF graceful
restart is enabled and the management unit in a stack fails, the hardware can continue to forward packets
using OSPF routes while a backup switch takes over management unit responsibility.
Graceful restart uses the concept of “helpful neighbors”. A fully adjacent router enters helper mode when
it receives a link state announcement (LSA) from the restarting management unit indicating its
intention of performing a graceful restart. In helper mode, a switch continues to advertise to the rest of
the network that they have full adjacencies with the restarting router, thereby avoiding announcement of
a topology change and and the potential for flooding of LSAs and shortest-path-first (SPF) runs (which
determine OSPF routes). Helpful neighbors continue to forward packets through the restarting router.
The restarting router relearns the network topology from its helpful neighbors.
Graceful restart can be enabled for either planned or unplanned restarts, or both. A planned restart is
initiated by the operator (see "Enabling and Disabling NSF" on page 258). The operator may initiate a
failover in order to take the management unit out of service (for example, to address a partial hardware
Table 9-18. OSPF Route Redistribution Summary Command
CLI Command Description
show ip ospf Displays OSPF route redistribution summary data.