GRT lookup allows routing from a VPRN to the GRT, and GRT leaking allows routing from the GRT to a VPRN. These features are particularly useful when VPRNs require routing to the Internet and the GRT already contains the Internet routing table. Wholesale/retail VPRNs and the routed CO VPRN have both GRT lookup and GRT leaking support.
The config>service>vprn>grt-lookup>export-grt command exports subscriber-related routes and protocols to the GRT. This allows traffic arriving from the network port to be routed downstream to the subscriber. The following configurations are supported in the downstream direction.
For an IPv4 numbered subscriber interface inside a routed CO VPRN, an IPv4 subscriber subnet can be exported as a policy using the config>service>vprn>grp-lookup>export-grt command, where the policy is configured with the config>router>policy-options>policy-statement command. For an IPv6 numbered subscriber interface inside a routed CO VPRN, an IPv6 subscriber subnet/prefix can be exported as a policy using the config>service>vprn>grp-lookup>export-grt command, where the policy is configured with the config>router>policy-options>policy-statement command.
Subscriber-related protocols (managed routes and subscriber management routes) inside a routed CO VPRN can be exported to the GRT.
For an IPv4 unnumbered subscriber interface inside a routed CO VPRN, subscriber host /32 routes are exported individually to the GRT using the ‟sub-mgmt” protocol.
The retail VPRN supports all items listed above for a Routed CO VPRN (exporting subscriber routes and protocols to the GRT using the config>service>vprn>grp-lookup>export-grt command). The retail VPRN does not export host routes by default. Therefore, the export-host-routes command may be required for a retail VPRN unnumbered subscriber interface.
The wholesale VPRN supports all items listed above for a Routed CO VPRN (exporting subscriber routes and protocols to the GRT by a route policy). However, retail-related routes that appear in the FDB of the wholesale VPRNs, cannot be exported. Retail-related routes must be exported individually within the VPRN to the GRT. This provides control over which retail VPRNs route to the GRT.
GRT lookup supports traffic from the subscriber to be routed upstream to the GRT. The following configurations are supported in an upstream direction:
Routed CO VPRN and grt-lookup
wholesale VPRN and grt-lookup
retail VPRN and grt-lookup
Not Supported
SRRP setup in Routed CO VPRN
SRRP setup in wholesale/retail VPRN