Overview
Page 928 7210 SAS-X OS Services Guide
Overview
NOTE: Port-based SHG is not supported on 7210 SAS-R6 devices.
The port-based split horizon feature can be used to disable local switching on the 7210 SAS. A
loop-free topology can be achieved using split horizon on 7210 SAS switches.
Traffic arriving on an access or port within a split horizon group will not be copied to other access
and ports in the same split horizon group, but will be copied to ports in other split horizon groups.
Since split horizon is a per port feature in , all SAPs associated with the port becomes part of split
horizon group configured on that port.
Topology
Figure illustrates an example of split horizon groups used to prevent communication between two
access SAPs and between two .
Figure 58: Split Horizon Group Example
Using 7210-SAS-X-1 as an example:
1. Split horizon group “access” is created to prevent any communication between the SAP’s
part of port 1/1/4 and port 1/1/5 (configured as access port) within the same VPLS.
2. Split horizon group is created to prevent any communication between port 1/1/1 and port
1/1/3 (configured as ) within the same VPLS.
3. VPLS 100 is created on 7210 SAS-1 with spoke SDPs on network port 1/1/1 and 1/1/3,
and SAPs on 1/1/4 and 1/1/5 as part of this VPLS. CE1, CE2 and CE3 are the customer
sites.
4. With this configuration, any communication between ports 1/1/4 and 1/1/5 gets blocked,
similarly communication between ports 1/1/1 and 1/1/3 gets blocked but any traffic
received on ports (for example, spoke SDPs on these ports) that belong to split horizon
group “network” will be switched to ports (for example, SAPs on these ports) that belong
to split horizon group “access” and vice versa based on the FDB entries for VPLS 100.
MPLS
CE-1 CE-3
CE-2
1/1/4
Access Port
Network Port
1/1/4
1/1/5
7210-SAS X 1
7210-SAS X 3
7210-SAS X 2
1/1/1
1/1/21/1/3
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