As of Junos version 10.1 there is a change to the way MPLS label stacking is handled. After upgrading a router from a Junos build older than Junos 10.1 to 10.1 (or higher), messages similar to the following are seen in the syslog messages: RPD_MPLS_INTF_MAX_LABELS_ERROR: Maximum labels exceeded - failed to stack additional label to nexthop on interface so-0/1/0.0 Having … [Read more...]