Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 513)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 489
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Flooding Layer 2 BPDUs with a VPLS instance
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Configuring VPLS MTU enforcement
The user can set the device to enforce the VPLS MTU value when establishing control sessions with
peers. This is done globally on the Brocade device using the vpls-mtu-enforcement command.
Brocade(config)# router mpls
Brocade(config-mpls)# vpls-mtu-enforcement
Syntax: [no] vpls-mtu-enforcement
NOTE
The vpls-mtu-enforcement command is global to all VPLS instances. It requires a reload to take
effect.
Configuring VPLS local switching
VPLS local switching is enabled by default, so packets received on a VPLS endpoint are flooded or
forwarded to other VPLS endpoints belonging to the VPLS instance. This mode of operation does
not require any configuration.
Using the no vpls-local-switching command, the user can disable VPLS local switching. With VPLS
local switching disabled, packets are only flooded to the VPLS peers in a VPLS instance and not to
the other VPLS endpoints belonging to that instance. Also, unicast traffic is discarded when it is
received on a VPLS endpoint and is meant to go out on another VPLS endpoint.
The user can disable VPLS local switching behavior on a per-VPLS basis using the no
vpls-local-switching command.
Brocade(config)# router mpls
Brocade(config-mpls)# vpls test 100
Brocade(config-mpls-vpls-test)# no vpls-local-switching
Syntax: [no] vpls-local-switching
Once the no vpls-local-switching command has been used to disable VPLS local switching, the user
can use the command without the [no] option to turn VPLS local switching on.
Special considerations
When using the VPLS local switching feature, consider the following:
• When the user toggles this option, all the MAC addresses that were learned on the VPLS
endpoints are flushed and re-learned
• This option does not affect IGMP and PIM snooping. Multicast traffic continues forwarding only
to those VPLS endpoints and peers from which a Join for the (S,G) is requested, regardless of
the status of the local switching option
• IEEE 802.1ag packets follow the local switching option. In other words, packets are forwarded
or flooded to other VPLS endpoints when local switching is enabled and discarded when local
switching is disabled.