Configuring IP Multicast Switching Interaction With Other Features
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 25-8
–Querying
– Forward Mode Selection
– Helper Address
– SSM Mapping
– Initial Packet Buffering
Consider the following operational guidelines when configuring IPMS for SPB services:
• IPMS must be explicitly enabled or disabled for each SPB service.
• Configuration of IPMS has no effect on non-IP multicast traffic.
• Because the IPMS querying operation is not supported on services, an external querier is required to
prevent group memberships from expiring.
• The flooding of unknown IP multicast traffic is the only supported mode of operation for SPB services.
– Flooding only occurs when the control plane software is initially learning and registering new
sources in the Layer 2 forwarding database (FDB).
• When IPMS is configured on at least one SPB service, the control plane begins processing unknown IP
multicast traffic from all services.
– IP multicast sources from services on which IPMS is enabled are forwarded to SDPs and SAPs on
which multicast routers or clients are present.
– IP multicast traffic from any service that does not have IPMS enabled, is flooded to all SDPs and
SAPs that are associated with the service.
– This process has no effect on IGMP or MLD protocol traffic.
– This process occurs independently for IPv4 and IPv6 multicast.
• Ingress flood rate limiting of IP multicast traffic is diminished when IPMS is used on SPB services.
– Ingress flood rate limiting of IP multicast traffic only applies when the control plane is learning and
registering new sources in the FDB.
– Do not configure IPMS for SPB services if this functionality is required.
• To help improve IPMS performance within the SPB service domain, consider the following
recommendations:
– Use IGMP version 3 (IGMPv3) and MLD version 2 (MLDv2).
– Enable the IPMS fast join function to help accelerate convergence and reduce network flooding.
– Increase the source timeout for snooping enabled services to help reduce control plane overhead.
• When configuring IPMS for an SPB service, make sure the service was configured to use the head-end
multicast mode; IPMS is not supported on SPB services that are configured to use the tandem mode.
• Using IPMS only on SPB services that are configured to perform VLAN translation is recommended.
• Using IPMS with wildcard SAP ports is not recommended.For example, 1/1/10:all, where "all"
specifies a wildcard SAP encapsulation of arbitrary customer VLANs (CVLAN). When a last member
query (group-specific or group-source-specific) is received, the last member query timeout processing
of memberships learned on a wildcard SAP only occurs if the query is untagged.
Refer to the “Service Manager Commands” chapter in the OmniSwitch AOS Release 8 CLI Reference
Guide and the “Configuring Shortest Path Bridging” chapter in the OmniSwitch AOS Release 8 Data
Center Switching Guide for more information about configuring SPB service components.
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