O'Reilly logo

JUNOS High Availability by Orin Blomberg, Senad Palislamovic, Kieran Milne, James Sonderegger

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

MPLS Signaling for High Availability

As previously mentioned, MPLS is unable to function at scale without the assistance of a signaling protocol. Signaling protocols come in many flavors, including standards-based and vendor-proprietary. Table 16-1 compares Juniper and Cisco support for various MPLS signaling protocols.

Table 16-1. Juniper and Cisco support for MPLS signaling protocols

Signaling protocol

Juniper support

Cisco support

Notes

Tag Distribution Protocol (TDP)

No

Yes

TDP is a Cisco-proprietary protocol.

Label Distribution Protocol (LDP)

Yes

Yes

Both Cisco and Juniper support LDP.

Resource Reservation Protocol (RSVP)

Yes

Yes

Supported by both Juniper and Cisco.

Resource Reservation Protocol with Traffic Engineering (RSVP-TE)

Yes

Yes

Functionality is supported by both Juniper and Cisco. The Juniper protocol naming convention does not draw a distinction between RSVP and RSVP-TE.

Static

Yes

No

Supported on Juniper platforms, though seldom used in high availability environments.

Constraint-Based Routing Label Distribution Protocol (CR-LDP)

No

No

This signaling protocol is supported by neither Juniper nor Cisco. It was deprecated by the Internet Engineering Task Force (IETF) in 2003.

With these considerations in mind, the only realistic choice of MPLS signaling protocols for label-switched paths (LSPs) that can cross between Juniper and Cisco routers is LDP for nontraffic-engineered applications, and RSVP for situations where traffic engineering is desirable. These are the only two signaling methods supported ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required