Enabling Multi-Process OSPF (OSPFv2, IPv4 Only)
Multi-process OSPF allows multiple OSPFv2 processes on a single router.
For more information, refer to Multi-Process OSPF (OSPFv2, IPv4 Only)
When configuring a single OSPF process, follow the same steps previously described. Repeat them as
often as necessary for the desired number of processes. After the process is created, all other
configurations apply as usual.
1. Assign an IP address to an interface.
CONFIG-INTERFACE mode
ip address ip-address mask
Format: A.B.C.D/M.
If you are using a Loopback interface, refer to Loopback Interfaces.
2. Enable the interface.
CONFIG-INTERFACE mode
no shutdown
3. Return to CONFIGURATION mode to enable the OSPFv2 process globally.
CONFIGURATION mode
router ospf process-id [vrf]
The range is from 0 to 65535.
After the OSPF process and the VRF are tied together, the OSPF process ID cannot be used again in
the system.
If you try to enable more OSPF processes than available Layer 3 interfaces, the following message
displays:
C300(conf)#router ospf 1
% Error: No router ID available.
Assigning an OSPFv2 Area
After you enable OSPFv2, assign the interface to an OSPF area. Set up OSPF areas and enable OSPFv2 on
an interface with the network command.
You must have at least one AS area: Area 0. This is the backbone area. If your OSPF network contains
more than one area, configure a backbone area (Area ID 0.0.0.0). Any area besides Area 0 can have any
number ID assigned to it.
The OSPFv2 process evaluates the network commands in the order they are configured. Assign the
network address that is most explicit first to include all subnets of that address. For example, if you assign
the network address 10.0.0.0 /8, you cannot assign the network address 10.1.0.0 /16 because it is already
included in the first network address.
698
Open Shortest Path First (OSPFv2 and OSPFv3)
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