Owner's Manual

497
Figure 13-56. Protocols -> Setup:MPLS (Bandwidth)
You can either set it generally (with the Bandwidth radio button and the field to its right), or Per
Class
(similarly) .
Options
This screen lets you configure MPLS options.
Figure 13-57. Protocols -> Setup:MPLS (Options)
It has the following checkboxes:
-
Advertise explicit Null —Advertise label 0 to the egress router of an LSP.
-
Disable TTL Propagation —Enter number of seconds.
-
Do Not Decrement the TTL —Disable normal TTL decrementing, which decrements the TTL
field in the IP header by 1. This statement decrements the IP TTL by 1 before encapsulating
the IP packet within an MPLS packet. When the penultimate router pops off the top label, it
does not use the standard write-back procedure of writing the MPLS TTL into the IP TTL
field. Therefore, the IP packet is decremented by 1. The ultimate router then decrements the
packet by one more for a total cloud appearance of 2, thus hiding the network topology.
-
Record Transit Routers —Check to enable.
-
Keep Backup Paths in Standby —Check to enable.
-
Disable Automatic Path Computation —Check to enable.
-
Enable ICMP Tunneling —Enables ICMP tunneling, which can be used for debugging and
tracing purposes.