Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 772)

748 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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Overview
7
Configuration Considerations
Consider the following before configuring routing over VPLS.
• When using VE over VPLS, the user must use a different loopback interface for MPLS and GRE
tunnels
• IGP may install VE over VPLS as a preferred route once it comes up, and MPLS protocols such
as LDP uses the VE over VPLS IP interface for control traffic
• When the loopback interface used by LDP is shared with GRE as one of the tunnel interfaces,
the LDP goes down forcing the VE over VPLS PW to go down.
Migration considerations
Routing over VPLS does not affect the legacy loopback configuration already deployed. When the
user chooses to migrate to the VE over VPLS solution, the following migration checks must be
considered.
• When the user is using a non-default VRF VE interface, the user must continue to use the
existing loopback emulation. Using the non-default VRF configuration is not supported.
• When the user is using the loopback configuration, and are using the VE interface on the
default-VRF, the user can move to the new VE over VPLS interface, provided all of the features
the user is currently using on the VE interface are supported using the new VEoVPLS interface.
Refer to
“Routing over VPLS supported features” on page 745 for additional information.