R2511-HP MSR Router Series Layer 3 - IP Routing Configuration Guide(V5)
69
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter OSPF view.
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ] *
N/A
3. Enter OSPF area view.
area area-id N/A
4. Configure ABR route
summarization.
abr-summary ip-address { mask |
mask-length } [ advertise |
not-advertise ] [ cost cost ]
Not configured by default.
The command is available on an
ABR only.
Configuring route summarization when redistributing routes into OSPF on an ASBR
Without route summarization, an ASBR advertises each redistributed route in a separate ASE LSA. After
a summary route is configured, the ASBR advertises only the summary route in an ASE LSA instead of
more specific routes, reducing the number of LSAs in the LSDB.
The ASBR summarizes redistributed Type-5 LSAs within the specified address range. If the ASBR is in an
NSSA area, it also summarizes Type-7 LSAs within the specified address range. If the ASBR is also the
ABR, it summarizes Type-5 LSAs translated from Type-7 LSAs.
To configure route summarization when redistributing routes into OSPF on an ASBR:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter OSPF view.
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ]*
N/A
3. Configure ASBR route
summarization.
asbr-summary ip-address { mask |
mask-length } [ tag tag | not-advertise
| cost cost ] *
The command is available on an
ASBR only.
Not configured by default.
Configuring OSPF inbound route filtering
OSPF calculates routes by using LSAs. The calculated routes can be filtered and only permitted routes are
installed into the OSPF routing table.
OSPF provides the following filtering methods:
• Filters routing information by destination address through ACLs and IP address prefixes.
• Filters routing information by next hop through the filtering criteria configured with the gateway
keyword.
• Filters routing information by destination address through ACLs and IP address prefixes and by next
hop through the filtering criteria configured with the gateway keyword.
• Filters routing information by routing policy specified by the route-policy keyword.
For more information about IP prefix list and routing policy, see "Configuring routing policies."
To configure inbound route filtering:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A