Adding interfaces to administrative groups – Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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Configuring MPLS
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outputs. For more information on the maximum reservable bandwidth configuration as displayed in
the output of the show mpls config command, refer to
“Displaying MPLS configuration
. For more information on the maximum reservable bandwidth configuration as
displayed in the output of the show mpls interface [ethernet slot/port] command, refer to
“Displaying information about MPLS-enabled interfaces”
.
Adding interfaces to administrative groups
The user can place individual interfaces into administrative groups. Administrative groups, also
known as resource classes or link colors, allows the user to assign MPLS-enabled interfaces to
various classes. For example, the user can define a group called “gold” and assign high-bandwidth
interfaces to it. When a device calculates the path for an LSP, it can take into account the
administrative group to which a interface belongs. The user can configure up to 32 administrative
groups. By default, an interface does not belong to any administrative groups.
Administrative groups are in the range 0 – 31. The user can see an administrative group either by
name or number. To see an administrative group by name, first create a name for the group and
associate the name with an administrative group number. Refer to
for details.
To assign MPLS-enabled interface e 3/1 to an administrative group called “gold”, enter the
following.
Brocade(config-mpls)# mpls-interface e 3/1
Brocade(config-mpls-interface)# admin-group gold
Syntax: [no] admin-group [number | name]
The number can be from 0 – 31. The administrative group name name must have been previously
configured.
An MPLS-enabled interface can belong to any number of administrative groups. For example, to
assign an interface to group “gold” and group 31, enter commands such as the following
.
Brocade(config-mpls)# mpls-interface e 3/1
Brocade(config-mpls-interface)# admin-group gold 31
After the user adds interfaces to administrative groups, the user can specify which groups can be
included or excluded from LSP calculations. Refer to
“Including or excluding administrative groups
.
IP-over-MPLS TTL propagation control
In the MPLS label header, the TTL field indicates the Time To Live (TTL) value for an MPLS packet.
For IP-over-MPLS applications, at the ingress LER an IP packet’s TTL value is decremented by one
and the IP checksum is recalculated. The IP packet’s TTL value is then copied to its MPLS TTL field.
At each transit LSR hop, the MPLS TTL value is decremented by 1. When the MPLS TTL value
reaches 1 or 0, the packet is discarded.