Controlling Bandwidth on LRE Links

Catalyst 2900 LRE XL switches control upstream and downstream rates on Long-Reach Ethernet (LRE) links by using configurations called profiles. You can assign profiles on a per-port or on a switch-wide basis. When the LRE port establishes a link with the CPE, the switch downloads its profile settings to the CPE port so that both ports on both devices operate with the same configuration.

The LRE link is the connection between the switch LRE port and the WAN port on a remote customer premises equipment (CPE) such as the Cisco 575 LRE CPE. The LRE link is not the same as the Ethernet link. For information about the LRE and Ethernet links on an LRE port, see LRE Port Considerations.

Catalyst 2900 LRE XL switches are shipped with predefined profiles (LRE Port Profiles) categorized as public (global) mode and private (per-port) mode profiles. By default, all LRE ports on the switch are enabled with the LRE-10 private profile in effect.

When assigning a profile to an LRE port, keep these considerations in mind:

To change the profile assigned to the LRE ports, use the LRE Profiles window. To display this window, choose Device > LRE Profiles.

To troubleshoot the connections to the LRE ports:

LRE Port Profiles

The data rates displayed from the show controllers lre status and show controllers lre profile commands are slightly different than those described in this table.

Profile NameLRE Link
Downstream
Rate (Mbps)
LRE Link
Upstream
Rate (Mbps)
Maximum Distance between
the LRE Port and the CPE
PUBLIC-ANSI
15.165.694101 ft (1250 m)
PUBLIC-ETSI11.3755.694101 ft (1250 m)
LRE-5
5.695.694921 ft (1500 m)
LRE-5LL
5.695.694921 ft (1500 m)
LRE-10 (default)11.37511.3754101 ft (1250 m)
LRE-10LL 11.37511.3754101 ft (1250 m)
LRE-1515.1617.063116 ft (950 m)
LRE-15LL15.1617.063116 ft (950 m)

Note: The interleaver feature, which protects against bursts of noise, is disabled when you use a profile ending in LL. We recommend that you use profiles LRE-5, LRE-10, or LRE-15 instead.