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Configuring the Ethernet Local Management Interface
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Configuring ELMI on the Switch
This section describes how to configure ELMI:
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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
20-62
PE1 is a WS-C6509 chassis switch with a WS-SUP720-3BXL as the supervisor engine that runs
Catalyst software release 8.7(2).
PE2 is a WS-C6509 chassis switch with a WS-SUP32-10GE-3B supervisor engine that runs Catalyst
software release 8.7(2).
PE3 is a WS-C6513 chassis switch with a WS-SUP720-3BXL supervisor engine that runs Catalyst
software release 8.7(2).
PE1, PE2, and PE3 switches have VLANs 10 and 250 (switch VLANs) configured as CFM VLANs.
The ELMI protocol runs between the PE1 switch and CE1-Cisco Internet Switch and Router (ISR)
3845.
The remote MEPs Continuity Check Database (CCDB) cataloging occurs on all 3 PE switches for
VLANs 10 and 250.
All connected ports are 802.1Q trunk ports that carry the above VLANs.
Before you can enable and have a working ELMI between PE1-Supervisor Engine 720 WS-C6509
and CE1-ISR 3845, CFM MEPs that are up must exist on edge switch PE1 (port 4/4).
the CFM MEP that is up also exists on edge switches PE2 and PE3 on ports 11/38 and 4/5,
respectively. In the figure, the configuration steps are required so that the PE switch for the ELMI
protocol can be enabled and the ELMI frames can be exchanged between the PE1 switch and
CE1-ISR3845.
You must enable ELMI on the switch globally.
Enable ELMI on the PE1 port 4/4 that connects to the CE device.
Multipoint EVCs (EVC 250 and EVC 10 that have a Uni-count of 3 for UNI-A, UNI-B, and UNI-C)
are configured on a PE switch that is mapped to VLANs 10 and 250 on which CFM inward MEPs
exist. The EVCs are also mapped to CE VLANs 10 and 250.
The UNI ID and UNI type is configured on the PE edge. Port 4/4 connects to the ISR CE switch.
Port 4/4 is a dot1q trunk port and the UNI service bundling type configured on the port is multiplex.
The EVCs are mapped onto the PE port 4/4 that connects to the CE1 ISR3845.
The ELMI frames between PE1 and CE1- ISR3845 are exchanged once you enable ELMI on the
CE1-ISR3845 and the ELMI protocol is up between PE1 and CE1-ISR3845.
The ELMI protocol carries the following information in ELMI frames from the PE to the CE using
the ELMI status messages:
Notification to the CE about the status of an EVC.
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Communication of UNI and EVC attributes to the CE.
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Enabling or Disabling ELMI, page 20-63
Enabling or Disabling an EVC, page 20-63
Configuring ELMI on an Individual Port, page 20-64
Chapter 20
Checking Status and Connectivity
Figure 20-4
OL-8978-04
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Troubleshooting
