Routing
Routing

What are the label-switched interface (LSI) label value assignments for different services?

by Juniper Employee on ‎02-04-2016 08:16 AM - edited on ‎09-22-2017 09:33 AM by Administrator Administrator (5,544 Views)

Question

What are the label-switched interface (LSI) label value assignments for different services?

Answer

VPLS uses a dynamic virtual tunnel logical interface on a tunnel PIC to model traffic from a remote PE router site in a VPLS domain. All traffic coming from the remote site is treated as if it is coming over the virtual port that represents this remote site, for the purposes of Ethernet flooding, forwarding, and learning.

 

In this approach, an MPLS lookup based on the inner VPN label is done on a PE router in the CF chip or R-chip. The label is stripped and the Layer 2 Ethernet frame it contained is forwarded to a tunnel PIC. The tunnel PIC loops the packet back, then a lookup is performed based on Ethernet MAC addresses.

 

Drawbacks to this approach include creating a bottleneck at the tunnel PIC and requiring the PE router to perform two lookups.

 

By default, VPLS uses a tunnel PIC. If the no-tunnel-services statement is configured under a VPLS instance, it uses an LSI and does not require a tunnel PIC.

 

The current label numbering assignment is listed in the following table:

 

Services

Label Values

Reserved

0 - 15

LSI VPN

16 - 2047

LSP VPLS

2048 - 4095

Unassigned

4096 - 10,000

Static LSP

10,000-99,999

Global

100000-799999

Block Allocation

800000-899999

Per Intf

900000-999999

 

For more information, click Layer 2 VPNs and VPLS Feature Guide.