 | Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
MPLS supports equal-cost multipath (ECMP) labels. A maximum of 16 MPLS paths is supported; 4 paths are available by default. On LERs, MPLS ECMP next hops can be used in the IP routing table for non-VPN and VPN routes. On LSRs, an incoming label can point to either an MPLS ECMP next hop or an IP ECMP.
The signaling protocol determines whether ECMP next hops are used. For example, LDP can learn multiple labels for a route from different downstream peers (or one label from a downstream peer that has parallel connections to the router). LDP then creates an MPLS ECMP next hop that can be used in the IP routing table. If LDP also advertises a label, then a forwarding entry is added to the MPLS forwarding table with the ECMP next hop.
| Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |