324 CHAPTER 12: MULTIPOINT LINK AGGREGATION (MPLA)
3500
9000
✓ 9400
3900
9300
bridge mpla mode Enables or disables the MultiPoint Link Aggregation f eature on the
switch.
Valid Minimum Abbreviation
b mp m
Important Considerations
■Use only CoreBuilder 9400 systems as MPLA core switches.
The core of a multipoint aggregated link must contain two 9400
switches, whose out-of-band management ports al so must be directly
connected.
■Use only Switch 3900 devices as edge switches.
Each MPLA edge switch must have at least one physical link to each
core switch. Multiple trunked links may connect an edge and core
switch, for added bandwidth
■Use only Gigabit Ethernet links between MPLA core switches and
edge switches.
■All links from an edge switch to the MPLA core switches must be
aggregated (trunked) at the edge switch.
■While the Trunk Control Message Protocol (TCMP) is optional in
point-to-point trunks, you must configure it to run on a ll of the
point-to-multipoint links between MPLA ed ge switches and core
switches.
■You can enable these features in MPLA edge switches, but not in
MPLA core switches:
■Spanning Tree
■IGMP snooping
■Resilient links
■Roving analysis port
■When you configure a new MPLA core switc h, define MPLA
configurations and reboot the switch before you define other trunks
and VLANs on the switch.