Ethernet redundancy configuration example for LAN-to-LAN DLSw
Network requirements
As shown in Figure 82:
DLSw operates in LAN-to-LAN mode.
Configure DLSw on Router A, Router B, and Router C to connect the IBM host with the SNA host through the Internet.
Configure Router B as the primary router and Router C as the secondary router to implement DLSw Ethernet redundancy.
Figure 82: Network diagram
![](images/image78.png)
Configuration procedures
Configure Router A:
# Configure interfaces on Router A to make sure that the local DLSw peer 1.1.1.1 and remote peers 2.2.2.2 and 3.3.3.3 can reach each other. (Details not shown.)
# Configure DLSw on Router A.
<RouterA> system-view [RouterA] bridge enable [RouterA] bridge 5 enable [RouterA] dlsw local 1.1.1.1 [RouterA] dlsw remote 2.2.2.2 [RouterA] dlsw remote 3.3.3.3 [RouterA] dlsw bridge-set 5 [RouterA] interface ethernet 1/0 [RouterA-Ethernet1/0] bridge-set 5
Configure Router B:
# Configure interfaces on Router B to make sure that the local DLSw peer 2.2.2.2 and remote peer 1.1.1.1 can reach each other. (Details not shown.)
# Configure DLSw on Router B.
<RouterB> system-view [RouterB] dlsw local 2.2.2.2 [RouterB] dlsw remote 1.1.1.1
# Enable DLSw Ethernet redundancy on interface Ethernet 1/0, and configure the multicast address as 9999-9999-9999 and set the priority to 10 for primary/secondary router election.
[RouterB] interface ethernet 1/0 [RouterB-Ethernet1/0] dlsw ethernet-backup enable 9999-9999-9999 priority 10
Configure Router C:
# Configure interfaces on Router C to make sure that the local DLSw peer 3.3.3.3 and remote peer 1.1.1.1 can reach each other. (Details not shown.)
# Configure DLSw on Router C.
<RouterC> system-view [RouterC] dlsw local 3.3.3.3 [RouterC] dlsw remote 1.1.1.1
# Enable DLSw Ethernet redundancy on Ethernet 1/0, and configure the multicast address as 9999-9999-9999 for primary/secondary router election.
[RouterC] interface ethernet 1/0 [RouterC-Ethernet1/0] dlsw ethernet-backup enable 9999-9999-9999
The Ethernet redundancy function will select a router as the primary router. Hewlett Packard Enterprise recommends that you configure a high-performance router as the primary router by setting a higher priority for the router.