Information About Configuring 802.1Q Vlan Interfaces; Subinterfaces - Cisco NCS 5500 Series Configuration Manual

Configuring 802.1Q VLAN Interfaces
or
RP/0/RP0/CPU0:router(config)# commit
Saves configuration changes.
• When you issue the end command, the system prompts you to commit changes:
Uncommitted changes found, commit them before exiting(yes/no/cancel)?
[cancel]:
- Entering yes saves configuration changes to the running configuration file, exits the configuration session, and
returns the router to EXEC mode.
- Entering no exits the configuration session and returns the router to EXEC mode without committing the
configuration changes.
- Entering cancel leaves the router in the current configuration session without exiting or committing the configuration
changes.
• Use the commit command to save the configuration changes to the running configuration file and remain within
the configuration session.

Information About Configuring 802.1Q VLAN Interfaces

To configure 802.1Q VLAN interfaces, you must understand these concepts:

Subinterfaces

Subinterfaces are logical interfaces created on a hardware interface. These software-defined interfaces allow
for segregation of traffic into separate logical channels on a single hardware interface as well as allowing for
better utilization of the available bandwidth on the physical interface.
Subinterfaces are distinguished from one another by adding an extension on the end of the interface name
and designation. For instance, the Ethernet subinterface 23 on the physical interface designated TenGigE
0/1/0/0 would be indicated by TenGigE 0/1/0/0.23.
Before a subinterface is allowed to pass traffic it must have a valid tagging protocol encapsulation and VLAN
identifier assigned. All Ethernet subinterfaces always default to the 802.1Q VLAN encapsulation. However,
the VLAN identifier must be explicitly defined.
These are the applicable scale values for sub-interfaces:
• Sub-interface per system = 1024
• Sub-interface per line card = 1024
• Sub-interface per NPU = 1024
• Sub-interface per interface = 512
• Sub-Interface per Core = 512
Interface and Hardware Component Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.1.x
Information About Configuring 802.1Q VLAN Interfaces
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