H3C Technologies H3C S7500E Series Switches - Manual (Page 100)

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To do… Use the command… Remarks
Enter system view system-view —
Enter OSPF view
ospf [ process-id | router-id router-id
| vpn-instance instance-name ] *
—
Enter OSPF area view area area-id —
Configure ABR route
summarization
abr-summary ip-address { mask |
mask-length } [ advertise |
not-advertise ] [ cost cost ]
Required
The command is available on an
ABR only.
Not configured by default.
Configuring route summarization when redistributing routes into OSPF on an ASBR
If summarization for redistributed routes is not configured on an ASBR, it will advertise each
redistributed route in a separate ASE LSA. After a summary is configured on the ASBR, it advertises
only the summary route in an ASE LSA instead of more specific routes, thus reducing the number of
LSAs in the LSDBs.
If summarization for redistributed routes is configured on an ASBR, it will summarize redistributed
Type-5 LSAs that fall into the specified address range. If the ASBR is in an NSSA area, it also
summarizes Type-7 LSAs that fall into the specified address range. If the ASBR is also the ABR, it will
summarize Type-5 LSAs translated from Type-7 LSAs.
Follow these steps to configure route summarization when redistributing routes into OSPF on an
ASBR:
To do… Use the command… Remarks
Enter system view system-view —
Enter OSPF view
ospf [ process-id | router-id router-id
| vpn-instance instance-name ]*
—
Configure ASBR route
summarization
asbr-summary ip-address { mask |
mask-length } [ tag tag |
not-advertise | cost cost ] *
Required
The command is available on an
ASBR only.
Not configured by default.
Configuring OSPF Inbound Route Filtering