Graceful Restart; Commands In This Chapter - Dell PowerEdge M420 Reference Manual

Graceful Restart

The PowerConnect implementation of OSPFv2 supports graceful restart as
specified in RFC 3623. Graceful restart works in concert with PowerConnect
nonstop forwarding to enable the hardware to continue forwarding IPv4
packets using OSPFv2 routes while a backup unit takes over management
unit responsibility. When OSPF executes a graceful restart, it informs its
neighbors that the OSPF control plane is restarting, but that it will be back
shortly. Helpful neighbors continue to advertise to the rest of the network
that they have full adjacencies with the restarting router, avoiding
announcement of a topology change and everything that goes with that (i.e.,
flooding of LSAs, SPF runs). Helpful neighbors continue to forward packets
through the restarting router. The restarting router relearns the network
topology from its helpful neighbors.
PowerConnect implements both the restarting router and helpful neighbor
features described in RFC 3623.

Commands in this Chapter

This chapter explains the following commands:
area default-cost
(Router OSPF)
area nssa (Router
OSPF)
area nssa default-
info-originate
area nssa no-
redistribute
area nssa no-
summary
area nssa
translator-role
area nssa
translator-stab-intv
1068
OSPF Commands
bandwidth
capability opaque
clear ip ospf
compatible rfc1583 ip ospf transmit-
default-
information
originate
default-metric
distance ospf
ip ospf network
ip ospf priority
ip ospf retransmit-
interval
delay
maximum-paths
network area
nsf
show ip ospf area
show ip ospf asbr
show ip ospf database
show ip ospf database
database-summary
show ip ospf interface
show ip ospf interface
brief
show ip ospf interface
stats