Design Reference

Table Of Contents

• The Virtual Services Platform 9000 and Virtual Services Platform 4000 designate the VLAN as

operationally up only if there is a matching I-SID in the SPBM network. For more information,

see the following sections.

Ethernet Routing Switch 8800 implementation

If a VLAN has an IP address and is attached to an I-SID, the ERS 8800 designates that VLAN as

operationally up whether it has a member port or not. When the VLAN is operationally up, the IP

address of the VLAN will be in the routing table.

The ERS 8800 design behaves this way because the VLAN might be acting as an NNI in cases of

Layer 2 Inter-VSN routing. If the VLAN was acting as a UNI interface, it would require a member

port.

Virtual Services Platform 9000 and Virtual Services Platform 4000 implementation

If a VLAN is attached to an I-SID there must be another instance of that same I-SID in the SPBM

network.

• If another instance of that I-SID exists, the device designates that VLAN as operationally up

regardless of whether it has a member port or not.

When the VLAN is operationally up, the IP address of the VLAN will be in the routing table.

• If no matching instance of the I-SID exists in the SPBM network, then that VLAN has no

reachable members and does not act as an NNI interface.

The VLAN does not act as a UNI interface because it does not have a member port.

Therefore, the device does not designate the VLAN as operationally up because the VLAN

does not act as a UNI or an NNI interface.

If the device acts as a BCB with two VLANs configured and two I-SIDs, there must be a UNI side

with the corresponding I-SID existing in the network.

If the device acts as both BEB and BCB, then there must be a member port in that VLAN to push

out the UNI traffic.