Stripping MPLS Labels on ATM, Ethernet-Based and SONET/SDH Router Interfaces
Because flow monitoring can be performed only on
IPv4 packets, any packets containing MPLS labels must have the labels
removed before monitoring can occur. To remove MPLS labels from packets
as they enter an ATM2 IQ, Ethernet-based, or SONET/SDH interface,
include the pop-all-labels statement at the [edit
interfaces interface-name-fpc/pic/port (atm | fastether
| gigether | sonet)-options mpls] hierarchy level. If you use
static MPLS labels, we recommend you assign label values from 10000 through 99999 to avoid using the label ranges
reserved by the Junos OS.
To remove a specified number of labels from selected
packets with MPLS labels, include the required-depth statement
at the [edit interfaces interface-name-fpc/pic/port (atm | fastether | gigether | sonet)-options mpls pop-all-labels] hierarchy level. A required-depth value of 1 removes
labels from all packets containing only one MPLS label, a value of 2 removes labels from all packets containing only two MPLS labels,
and a value of [1 2] removes labels from all packets containing
either one or two MPLS labels. The required-depth value of [1 2] is the default setting. When you configure the required-depth statement, you must configure the same value for all ports on the
same PIC.
The labels are removed and discarded as soon as they arrive at the interface. As a result, no MPLS filters can be applied to the stripped labels, no statistics are generated for the labels, and you cannot apply an IP filter to the incoming packets. No Tunnel Services PIC is required to perform MPLS label stripping.
[edit]
interfaces {
at-/fpc/pic/port {
atm-options {
mpls {
pop-all-labels {
required-depth 1;
}
}
}
}
(fe | ge)-fpc/pic/port {
(fastether | gigether)-options {
mpls {
pop-all-labels {
required-depth [1 2];
}
}
}
}
so-fpc/pic/port {
sonet-options {
mpls {
pop-all-labels {
required-depth 2;
}
}
}
}
}