Virtual Private LAN Services
7750 SR OS Services Guide Page 347
IOM Chain Management
As previously stated, the IOM automatically creates the chain lists from the available egress
multicast group SAPs. The IOM will create chains from the available SAPs based on the
following rules:
1. SAPs from different egress multicast groups must be in different chains (a chain can only
contain SAPs from the same group)
2. Alien and native SAPs must be in different chains
3. A specific chain cannot be longer than the defined dest-chain-limit parameter for the egress
multicast group to which the SAPs belong
Given the following conditions for an IOM creating a multicast forwarding list (List 1) for a Layer
2 IP multicast (s,g) native to VPLS instance 100:
• Egress multicast group A
→ Destination chain length = 16
→ 30 member SAPs on VPLS 100 joined (s,g) (native to VPLS 100)
→ 41 member SAPs on other VPLS instances joined (s,g) (alien to VPLS 100)
• Egress multicast group B
→ Destination chain length = 8
→ 17 member SAPs on VPLS 100 joined (s,g) (native to VPLS 100)
• Egress multicast group C
→ Destination chain length = 12
→ 23 member SAPs on other VPLS instances joined (s,g) (alien to VPLS 100)
The system will build the SAP chains for List 1 according to Table 12.
Table 1: SAP Chain Creation
Egress Forwarding List 1 SAP Chains
Egress Multicast Group A
Destination Chain Length 16
Egress Multicast Group B
Destination Chain Length 8
Egress Multicast Group C
Destination Chain Length 12
Native Chains Alien Chains Native Chains Alien Chains Native Chains Alien Chains
16 16 8 12
14 16 8 11
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