394 BigIron RX Series Configuration Guide53-1001810-01Master VLANs and customer VLANs in a topology group14• If an RHP reaches the Master node’s secondary interface, the ring is intact. The secondaryinterface changes to Blocking. The Master node sets the forwarding bit on in the next RHP.When the restored interfaces receive this RHP, they immediately change state to Forwarding.• If an RHP does not reach the Master node’s secondary interface, the ring is still broken. TheMaster node does not send an RHP with the forwarding bit on. In this case, the restoredinterfaces remain in the Preforwarding state until the preforwarding timer expires, then changeto the Forwarding state.Master VLANs and customer VLANs in a topology groupAll the ring ports must be in the same VLAN. Placing the ring ports in the same VLAN provides Layer2 connectivity for a given customer across the ring. Figure 68 shows an example.FIGURE 68 Metro ring – ring VLAN and customer VLANsNotice that each customer has their own VLAN. Customer A has VLAN 30 and Customer B hasVLAN 40. Customer A’s host attached to Switch D can reach the Customer A host attached toSwitch B at Layer 2 through the ring. Since Customer A and Customer B are on different VLANs,they will not receive each other’s traffic.============Customer AVLAN 30Customer BVLAN 40Customer AVLAN 30Customer BVLAN 40Switch BSwitch Dport2/1 port4/1port1/2 port1/1port2/1 port4/1port1/2 port1/1Switch Dring 1interfaces 1/1, 1/2topology group 2master VLAN 2 (1/1, 1/2)member VLAN 30 (1/1, 1/2, 2/1)member VLAN 40 (1/1, 1/2, 4/1)ring 1interfaces 1/1, 1/2topology group 2master VLAN 2 (1/1, 1/2)member VLAN 30 (1/1, 1/2, 2/1)member VLAN 40 (1/1, 1/2, 4/1)Switch B
