Per-service split horizon groups are supported on all 7210 SAS platforms as described in this document, except those operating in access-uplink mode.
To configure a VPLS service with a split horizon group, add the split-horizon-group parameter when creating the SAP. Traffic arriving on a SAP within a split horizon group will not be copied to other SAPs in the same split horizon group.
The following is a sample VPLS configuration output with split horizon enabled.
*A:ALA-1>config>service# info
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...
vpls 800 customer 6001 vpn 700 create
description "VPLS with split horizon for DSL"
stp
shutdown
exit
sap 1/1/3:100 split-horizon-group DSL-group1 create
description "SAP for residential bridging"
exit
sap 1/1/3:200 split-horizon-group DSL-group1 create
description "SAP for residential bridging"
exit
split-horizon-group DSL-group1
description "Split horizon group for DSL"
exit
no shutdown
exit
...
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*A:ALA-1>config>service#