To use single-active multi-homing on PE-1 and PE-2 instead of all-active multi-homing perform the following:
Change the LAG configuration to multi-homing single-active.
The CE-12 is now configured with two different LAGs; therefore, the key, system ID, and system priority values must be different on PE-1 and PE-2.
Change the Ethernet segment configuration to multi-homing single-active
No changes are needed at the service level on any of the three PEs.
The following configuration example shows the differences between single-active multi-homing and all-active multi-homing.
A:PE1# configure lag 1
A:PE1>config>lag# info
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mode access
encap-type dot1q
port 1/1/2
lacp active administrative-key 1 system-id 00:00:00:00:69:69
no shutdown
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A:PE1>config>lag# /configure service system bgp-evpn
A:PE1>config>service>system>bgp-evpn# info
esi 00:de:01:00:00:00:00:00:00:01
service-carving
mode auto
exit
multi-homing single-active
lag 6
no shutdown
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A:PE2# configure lag 1
A:PE2>config>lag# info
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mode access
encap-type dot1q
port 1/1/3
lacp active administrative-key 1 system-id 00:00:00:00:72:72
no shutdown
----------------------------------------------
A:PE2>config>lag# /configure service system bgp-evpn
A:PE2>config>service>system>bgp-evpn# info
esi 00:de:01:00:00:00:00:00:00:01
service-carving
mode auto
exit
multi-homing single-active
lag 6
no shutdown