Beta Draft Confidential
Configuring ATM Over MPLS Gateway Solution on CBX 3500
Configuring a Layer 2 Tunnel Over MPLS Core Network
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/059-51
Configuring a Layer 2 Tunnel
A Layer 2 tunnel is an end-to-end tunnel through the PSN tunnel, with endpoints on
ATMoMPLS gateway switches. It can be configured as either VNN or PNNI. In the
Layer 2 tunnel, circuits are dynamic. Since the Layer 2 tunnel behaves like a VNN
direct trunk or PNNI link, any circuit can be configured over it. In this case, the Layer
2 tunnel is statically configured and doesn’t use LDP.
Layer 2 tunnels endpoints must be configured on like ATM or Frame Relay endpoints
(ATM-ATM or FR-FR) on a CBX 3500 switch with POS cards installed and
configured.
To configure a Layer 2 Tunnel:
1. In the Network object tree, expand the instance node for the network that contains
the switch.
2. Expand the Switches class node and double-click on the instance node for the
switch.
3. The switch object tree appears in the Navigation Panel.
4. Right-click on Layer2 Tunnels and select Add. The Add Tunnel dialog box
appears (Figure 9-25).
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