Design Reference

can participate in the same Layer 2 or Layer 3 VSN. This same simplicity extends to
provisioning the services to run above the SPBM backbone:
• To create a Layer 2 VSN, associate an I-SID number with an edge VLAN.
• To create a Layer 3 VSN, associate an I-SID number with a VRF and configure the desired
IS-IS IP route redistribution within the newly created Layer 3 VSN.
Note:
No service provisioning is needed on the core BCB SPBM switches. This provides a robust
carrier grade architecture where configuration on the core switches never needs to be
touched when adding new services.
IP multicast over SPBM
Provisioning IP multicast over SPBM is as simple as enabling SPBM multicast on the BEBs.
You do not need to enable IP multicast over SPBM on the BCBs.
For Layer 2 VSN using IP multicast over SPBM, configure IGMP snooping on the VLAN that
represents the Layer 2 VSN.
For Layer 3 VSNs using IP multicast over SPBM, configure the Layer 3 VSN as a multicast
VSN, and then enable IP multicast over SPBM on each VLAN within the VRF to which IP
multicast senders and receivers attach.
For IP Shortcuts using IP multicast over SPBM, enable IP multicast over SPBM on each of the
VLANs within the GRT that need to support IP multicast traffic.
Implementation options
The SPBM architecture is architecturally simple and easy to provision, but it is not just for
simple networks. SPBM supports multiple implementation options within the same network to
meet the demands of the most complex network configurations. The following figure shows
how SPBM supports multiple campus networks as well as multiple data centers.
Implementation options
Network Design Reference for Avaya VSP 4000 February 2014 77