Configuring interVRF route redistribution for OSPF
Use route redistribution so that a VRF interface can announce routes learned by other protocols, for example, OSPF or BGP. The switch supports interVRF route redistribution. Use a route policy to control the redistribution of routes.
You can also redistribute inter-VRF DvR routes to OSPF.
Before you begin
-
Enable OSPF globally.
-
Ensure that a route policy exists.
-
Ensure that the VRFs exist.
Note
The route policies treat permit and deny rules differently for inbound and outbound traffic.
-
For an in-policy (RIP, BGP) or an accept policy (OSPF) using a route-map, if a particular route is not explicitly denied in the accept policy or in-policy with the route-map, then the route is implicitly allowed.
-
For an out-policy (RIP, BGP) or a redistribute policy (RIP, OSPF, BGP) using a route-map, even if a particular route is not explicitly allowed in the redistribution policy or out-policy with the route-map, then the route is implicitly denied.
-
In order to permit or deny only explicit routes, configure a policy with additional sequences, where, the last sequence permits all routes that are not explicitly permitted or denied.
Procedure
Example
Example 1:
Create the redistribution instance, apply a route policy, enable the redistribution, and apply the redistribution.
Switch:1>enable Switch:1#configure terminal Switch:1(config)#router vrf red Switch:1(router-vrf)#ip ospf redistribute isis Switch:1(router-vrf)#ip ospf redistribute isis route-map test2 Switch:1(router-vrf)#ip ospf redistribute isis enable Switch:1(router-vrf)#exit Switch:1(config)#ip ospf apply redistribute isis
Example 2:
This example demonstrates redistribution of inter-VRF routes (both direct and DvR routes) to OSPF, with a route policy configured.
Redistribute inter-VRF DvR routes between VRFs (with VRF IDs 10 and 30), to OSPF.
Switch:1>enable Switch:1#configure terminal Switch:1(config)#router vrf 10 Switch:1(router-vrf)#ip prefix-list "test10" 192.0.2.0/24 ge 25 le 32 Switch:1(router-vrf)#route-map "test10" 1 Switch:1(router-vrf)#permit Switch:1(router-vrf)#enable Switch:1(router-vrf)#match network "test10" Switch:1(router-vrf)#set metric 99 Switch:1(router-vrf)#exit Switch:1(config)#router vrf 30 Switch:1(router-vrf)#ip ospf redistribute direct vrf-src 10 Switch:1(router-vrf)#ip ospf redistribute direct enable vrf-src 10 Switch:1(router-vrf)#ip ospf redistribute dvr vrf-src 10 Switch:1(router-vrf)#ip ospf redistribute dvr route-map "test10" vrf-src 10 Switch:1(router-vrf)#ip ospf redistribute dvr enable vrf-src 10 Switch:1(router-vrf)#exit Switch:1(config)#ip ospf apply redistribute direct vrf 30 vrf-src 10 Switch:1(config)#ip ospf apply redistribute dvr vrf 30 vrf-src 10
Variable definitions
The following table defines parameters for the ip ospf redistribute command.
Variable |
Value |
---|---|
enable |
Enables the OSPF route redistribution instance. |
metric <0–65535> |
Configures the metric to apply to redistributed routes. |
metric-type <type1|type2> |
Specifies a metric. For metric type 1, the cost of the external routes is equal to the sum of all internal costs and the external cost. For metric type 2, the cost of the external routes is equal to the external cost alone. |
route-map WORD<0-64> |
Configures the route policy to apply to redistributed routes. |
subnets <allow|suppress> |
Allows or suppresses external subnet route advertisements when routes are redistributed into an OSPF domain. |
vrf-src WORD<1-16> |
Specifies the optional source VRF instance. You can use this variable with the other command variables. |
<bgp|direct|isis|ospf|rip|static|dvr> |
Specifies the type of routes to redistribute (the protocol source). Valid options are bgp, isis, direct, rip, ospf, static or dvr. |
The following table defines parameters for the ip ospf apply redistribute command.
Variable |
Value |
---|---|
vrf WORD<1-16> |
Specifies the VRF instance. |
vrf-src WORD<1-16> |
Specifies the source VRF instance. You do not need to configure this parameter for redistribution within the same VRF. |
WORD<0–32> |
Specifies the type of routes to redistribute (the protocol source). Valid options are bgp, isis, direct, rip, ospf, or static. |