Page 154 7750 SR OS Services Guide
The age of the MAC address entry in the FIB is set by the age timer. If mac-aging is disabled on a
given VPLS service, any MAC address learned on a SAP/SDP with mac-pinning enabled will
remain in the FIB on this SAP/SDP forever. Every event that would otherwise result in re-learning
will be logged (MAC address; original-SAP; new-SAP).
Note that MAC addresses learned during DHCP address assignment (DHCP snooping enabled) are
not impacted by this command. MAC-pinning for such addresses is implicit.
Default When a SAP or spoke SDP is part of a Residential Split Horizon Group (RSHG), MAC pinning is
activated at creation of the SAP. Otherwise MAC pinning is not enabled by default.
max-nbr-mac-addr
Syntax max-nbr-mac-addr table-size
no max-nbr-mac-addr
Context config>service>pw-template
Description This command specifies the maximum number of FDB entries for both learned and static MAC
addresses for this SAP or spoke SDP.
When the configured limit has been reached, and discard-unknown-source has been enabled for this
SAP or spoke SDP (see discard-unknown-source on page 150), packets with unknown source MAC
addresses will be discarded.
The no form of the command restores the global MAC learning limitations for the SAP or spoke SDP.
Default no max-nbr-mac-addr
Parameters table-size — Specifies the maximum number of learned and static entries allowed in the FDB of this
service.
Values 1 — 196607
Chassis-mode C limit: 511999
mfib-allowed-mda-destinations
Syntax mfib-allowed-mda-destinations
Context config>service>pw-template>egress
Description This command enables the context to configure MFIB-allowed MDA destinations.
The allowed-mda-destinations node and the corresponding mda command are used on spoke and
mesh SDP bindings to provide a list of MDA destinations in the chassis that are allowed as
destinations for multicast streams represented by [*,g] and [s,g] multicast flooding records on the
VPLS service. The MDA list only applies to IP multicast forwarding when IGMP snooping is enabled
on the VPLS service. The MDA list has no effect on normal VPLS flooding such as broadcast, L2
multicast, unknown destinations or non-snooped IP multicast.
At the IGMP snooping level, a spoke or mesh SDP binding is included in the flooding domain for an
IP multicast stream when it has either been defined as a multicast router port, received a IGMP query
through the binding or has been associated with the multicast stream through an IGMP request by a
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