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DES-7200 Configuration Guide Chapter 1 MPLS Configuration
1-13
DES-7200(config-if-type ID)# no mpls
mtu
Restore the default value of the MPLS mtu on
an interface.
Caution
The MPLS mtu on an interface cannot exceed the actual size of packets
transmitted on the interface. For the switches, this configuration is invalid.
The switches forward packets based on the mtu configured on actual
interfaces and directly discard the packets that exceed the mtu rather than
performing fragmentations. To adjust the mtu of an interface, you can use the
mtu command in the interface mode. Fragmentations are supported by only
process and router forwarding. In actual applications, you should adjust the
mtu value to avoid performance degradation due to fragmentations.
1.2.1.6 Fragmenting MPLS Packets (Optional)
By default, MPLS packets that exceed the MPLS mtu on an interface are fragmented as IP
fragmentations. The fragmented IP packets are still encapsulated with the original labels and
transmitted along the original LSP.
Run the no mpls ip fragment command to directly discard packets that should be fragmented.
Command Function
DES-7200(config)# no mpls ip
fragment
Directly discard MPLS packets that exceed the
MPLS mtu on an interface.
DES-7200(config)# mpls ip fragment
Restore the default value to fragment packets
that exceed the MPLS mtu on an interface.
Caution
This command is valid only for the encapsulated IP packets. It is invalid for
non-IP packets. This configuration is also invalid for the switches. The
switches directly discard packets that exceed the mtu on an interface.
Fragmentations are supported only in process forwarding.
1.2.1.7 Handling ICMP Error Messages
(Optional)
To handle ICMP error messages (such as typical MPLS TTL timeout messages) generated
during the forwarding of MPLS packets, you can use the mpls ip icmp-error pop labels
command to provide different processing methods for MPLS packets with different numbers of
labels. The default value of labels is 1. This indicates that the ICMP error messages generated