Huawei S6700 Series Configuration Manual page 138

S6700 Series Ethernet Switches
Configuration Guide - IP Routing
Data Preparation
To configure an NSSA, you need the following data.
No.
1
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
ospf [ process-id ]
The OSPF process view is displayed.
Step 3 Run:
area area-id
The OSPF area view is displayed.
Step 4 Run:
nssa [ default-route-advertise | flush-waiting-timer interval-value | no-import-
route | no-summary | set-n-bit | suppress-forwarding-address | translator-always |
translator-interval interval-value | zero-address-forwarding ]
The specified area is configured as an NSSA.
The nssa command is applicable to the following scenarios:
l The parameter default-route-advertise is used to advertise Type 7 LSAs carrying the default
l When the area to which the ASBR belongs is configured as an NSSA, invalid Type 5 LSAs
Issue 01 (2012-03-15)
Data
(Optional) Cost of the default route to the NSSA
NOTE
By default, the cost of the default route to the NSSA is 1.
NOTE
l All switches in the NSSA must be configured with NSSA attributes using the nssa command.
l Configuring or deleting NSSA attributes may trigger routing update in the area. A second configuration
of NSSA attributes can be implemented or canceled only after routing update is complete.
route on the ABR or ASBR to the NSSA.
Type 7 LSAs carrying the default route will be generated regardless of whether the default
route 0.0.0.0 exists in the routing table on the ABR. On the ASBR, however, the default Type
7 LSA is generated only when the default route 0.0.0.0 exists in the routing table.
from other switches in the area where LSAs are flooded will be reserved. These LSAs will
be deleted only when the aging time reaches 3600s. The switch performance is affected
because the forwarding of a large number of LSAs consumes the memory resources. To
resolve such a problem, you can set the parameter flush-waiting-timer to the maximum
value 3600s for Type 5 LSAs so that the invalid Type 5 LSAs from other switches can be
deleted in time.
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4 OSPF Configuration
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