Split Horizon group with spoke-SDPs is only supported on the 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C.
To configure spoke-SDPs with a split horizon group, add the split-horizon-group parameter when creating the spoke-SDP. Traffic arriving on a SAP or spoke-SDP within a split horizon group will not be copied to other SAPs or spoke-SDPs 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
spoke-sdp 51:15 split-horizon-group DSL-group1 create
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#