Design Reference

IS interfaces. The default values for these commands work well for most networks, including those
using moderately scaled routes. In highly scaled networks, you may need to configure higher values
for these commands.
VLACP
VLACP is generally used when a repeater or switch exists between connected VSP 4000 switches
to detect when a connection is not operational even when the link LED is lit.
SNMP traps
On each SPBM peer, if you configure the SPBM B-VLANs to use different VLAN IDs, for example,
VLAN 10 and 20 on one switch, and VLAN 30 and 40 on the second, the system does not generate
a trap message to alert of the mismatch because the two switches cannot receive control packets
from one another. Configure the SPBM B-VLANs to use matching VLAN IDs.
I-SID filters
The current release does not support I-SID filters.
Single-homed T-UNI service on a vIST-enabled node
If you configure a T-UNI service as a single-homed service on a vIST-enabled node, you must
configure the same ISID service without port/MLT being mapped to ISID, on the other vIST peer
node. Failure to perform this configuration on the vIST peer node can result in the loss of traffic to
the single-homed T-UNI service in various scenarios.
IP multicast over Fabric Connect restrictions
Review the following restrictions for the IP multicast over Fabric Connect feature.
IGMP
The BEB must be the only IGMP querier in the network. If the BEB receives an IGMP query from
any other device, it causes unpredictable behavior, including traffic loss.
SPBM supports IGMP Snooping on a C-VLAN, but it does not support Protocol-Independent
Multicast (PIM) on a C-VLAN. If you enable IGMP Snooping on a C-VLAN, then its operating mode
is Layer 2 VSN with IP multicast over Fabric Connect.
You must enable Source-Specific Multicast (SSM) snoop before you configure IGMP version 3, and
you must enable both SSM snoop and snooping for IGMPv3.
For IGMP Snooping, ensure that the IGMP version used by multicast hosts and other devices in the
network is either the same as the IGMP version configured on the IGMP Snooping VLAN, or that
compatibility mode is enabled.
SSM
If you delete any ssm-map in a static range group, the switch deletes the entire static range group.
For example, create an ssm-map for 232.122.122.122 to 232.122.122.122.128 and after that
configure this same range in a static group. If you delete any ssm-map between 232.122.122.122
and 232.122.122.128, the switch deletes the entire static range group.
IP multicast over Fabric Connect restrictions
June 2015 Network Design Reference for Avaya VSP 4000 Series 123
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