Assigning Profiles to LRE Ports

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.

The LRE link is the connection between the switch LRE port and the WALL port on a remote LRE customer premises equipment (CPE) such as the Cisco 575 LRE CPE. 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 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 (Types of LRE 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:

Types of LRE Profiles

The LL profiles have the interleaver feature turned off and the low-latency (LL) feature enabled. The low-latency (LL) feature does not delay data transmission, but it makes data more susceptible to interruptions on the LRE link. Use the LL profiles with care. All other profiles, public and private, have the interleaver feature enabled. The interleaver feature provides maximum protection against small interruptions on the LRE link but delays data transmission.

Note: Use the rates and distances in the table below as guidelines only. Factors such as the type of cable you use, how it is bundled, and the interference and noise on the LRE link can affect the actual LRE link performance. Contact Cisco Systems for information about limitations and optimization of LRE link performance. The net data rates in the table below are slightly less than the gross data rates displayed by the show controllers lre profile names privileged EXEC command.

Profile Name Profile Type LRE Link
Downstream
Rate (Mbps)
LRE Link
Upstream
Rate (Mbps)
Maximum Distance between
the LRE Port and the CPE
PUBLIC-ANSI
Public 15.17 4.27 4101 ft (1250 m)
PUBLIC-ETSI Public 11.375 4.27 4101 ft (1250 m)
LRE-5
Private 5.69 5.69 4921 ft (1500 m)
LRE-10 (default) Private 11.375 11.375 4101 ft (1250 m)
LRE-15 Private 15.17 17.06 3445 ft (950 m)
LRE-10-1 Private 11.38 1.43 4101 ft (1250 m)
LRE-10-3
Private 11.38 2.87 4101 ft (1250 m)
LRE-10-5 Private 11.38 5.69 4101 ft (1250 m)
LRE-5LL
Private 5.69 5.69 4921 ft (1500 m)
LRE-10LL Private 11.375 11.375 4101 ft (1250 m)
LRE-15LL Private 15.17 17.06 3445 ft (1050 m)