Enabling Eompls; Default Eompls Configuration; Eompls Configuration Guidelines - Cisco Catalyst 3750 Software Configuration Manual

Chapter 30 Configuring MPLS and EoMPLS
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Enabling EoMPLS

This section includes this information about configuring EoMPLS on a switch used as a PE router:
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Default EoMPLS Configuration

By default, EoMPLS is not configured.
The mpls ldp router-id command is disabled. No virtual connections are configured.

EoMPLS Configuration Guidelines

When you configure EoMPLS, you must follow these guidelines:
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EoMPLS and trunking restrictions:
– To support Ethernet spanning-tree bridge protocol data units (BPDUs) across an EoMPLS
backbone, you must disable spanning tree for the EoMPLS VLAN. This ensures that the
EoMPLS VLANs are carried only on the trunk to the customer switch.
– The native VLAN of a trunk cannot be an EoMPLS VLAN.
You can enable EoMPLS on 802.1Q interfaces by using the mpls l2transport route or the xconnect
interface configuration command.
Do not configure VLAN mapping on an interface configured for EoMPLS.
Default EoMPLS Configuration, page 30-15
EoMPLS Configuration Guidelines, page 30-15
Configuring EoMPLS, page 30-16
Packet Flow in an EoMPLS Network, page 30-17
EoMPLS requires that at least one of the two ES ports be configured for MPLS. Therefore, if you
want to run EoMPLS on an ES port, you can only configure it on the ES port that is not configured
for MPLS.
Before enabling EoMPLS, you must enable dynamic MPLS labeling by using the mpls ip interface
configuration command on all paths between the imposition and disposition LERs. MPLS is
globally enabled by default.
For VLAN-based EoMPLS, you must configure VLANs on the switch.
EoMPLS operation between two PE routers requires an LDP session between the routers. The IP
address used by each router as its LDP router ID must be IP-reachable by the other. Use the optional
mpls ldp router-id global configuration command to control the selection of the LDP router ID by
specifying the interface whose IP address should be used.
– If the specified interface is up and has an IP address, you can use the command without the
optional force keyword. When the router ID is selected, that IP address is selected as the router
ID.
If the specified interface is not up or does not have an IP address, use the force keyword with
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the command to ensure that the IP address of the specified interface is used when that interface
is brought up.
Catalyst 3750 Metro Switch Software Configuration Guide
Enabling EoMPLS
30-15