Virtual Interfaces - Cisco 7246VXR - uBR Router Software Configuration Manual

Chapter 1 Overview of Cisco uBR7200 Series Software

Virtual Interfaces

The Cisco uBR7200 Series supports the following virtual interface feature, primarily in the
Cisco IOS 12.3 BC release train:
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Virtual Interface Bundling on the Cisco uBR-MC28/U BPE
Cisco IOS Release 12.3(13a)BC introduces support for virtual interface bundling on the Cisco
uBR72046VXR universal broadband router and the Cisco uBR-MC28/U Broadband Processing Engine
(BPE).
In prior Cisco IOS releases, cable interface bundling was limited to physical interfaces as master or slave
interfaces, and show commands did not supply bundle information.
Virtual interface bundling removes the prior concepts of master and slave interfaces, and introduces
these additional changes:
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Virtual interface bundling prevents loss of connectivity on physical interfaces should there be a failure,
problematic online insertion and removal (OIR) of one line card in the bundle, or erroneous removal of
configuration on the master interface.
Virtual interface bundling supports and governs the following Layer 3 settings for the bundle member
interfaces:
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This virtual interface for the bundle should always remain on (enabled with no shutdown), but the
Note
Cisco CMTS provides warning messages prior to execution of the shutdown command.
OL-2239-05
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/uFGnpls1.html
Virtual Interface Bundling on the Cisco uBR-MC28/U BPE, page 1-125
Virtual interface bundling uses bundle interface and bundle members instead of master and slave
interfaces.
The virtual bundle interface is virtually defined, as with IP loopback addresses, for example.
Virtual interface bundling supports bundle information in multiple show ip interface commands.
IP address
IP helper-address
source-verify and lease-timer functions
cable dhcp-giaddr (The giaddr field is set to the IP address of the DHCP client.)
Protocol Independent Multicast (PIM)
Access control lists (ACLs)
Sub-interfaces
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
cops tcp window-size
1-125