The umr forward enable command enables UMR forwarding in a BD and all-0 MAC routes will be considered as UMR routes.
The undo umr forward enable command disables UMR forwarding in a BD and all-0 MAC routes will not be considered as UMR routes.
By default, UMR forwarding does not enable, MAC routes with all-0 address will be considered as MAC detail routes.
Usage Scenario
On a standard network, MAC routes of all users are transmitted through RRs on the entire network, which causes heavy pressure on RRs. In addition, the MAC address capacity of aggregation devices limits the number of home users that can access the network. Therefore, the UMR solution advertises an unknown MAC-route (UMR) route from the access device to the aggregation device, instead of advertising all specific MAC routes in the standard EVPN, reducing the pressure on RRs and MAC address learning on aggregation devices.
The receiving end uses umr forward enable command to control receiving UMR routes. When a MAC route with all-0 MAC addresses is received, it will be processed as an UMR route. Therefore, it will check UMR first then follow by BUM when it receives an unknown unicast packets.Prerequisites
UMR can only be configuredafter the BD is bound by an EVPN instance.
Precautions
EVPN instances on each pair of A-Leaf nodes are different and are isolated by RTs. Different A-Leaf pairs need to be configured with different BDs.
<HUAWEI> system-view [~HUAWEI] evpn vpn-instance 1 bd-mode [*HUAWEI-evpn-instance-1] route-distinguisher 1:1 [*HUAWEI-evpn-instance-1] vpn-target 1:1 export-extcommunity [*HUAWEI-evpn-instance-1] vpn-target 1:1 import-extcommunity [*HUAWEI-evpn-instance-1] quit [*HUAWEI] bridge-domain 1 [*HUAWEI-bd1] evpn binding vpn-instance 1 [*HUAWEI-bd1] umr forward enable