Prerequisites For Configuring Irb; Restrictions For Configuring Irb - Cisco NCS 5500 Series Configuration Manual

Integrated Routing and Bridging
• These characteristics determine when the the BVI line protocol state is up:

Prerequisites for Configuring IRB

You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command. If you suspect user group assignment is
preventing you from using a command, contact your AAA administrator for assistance.
Before configuring IRB, be sure that these tasks and conditions are met:
• Know the IP addressing and other Layer 3 information to be configured on the bridge virtual interface
• Complete MAC address planning if you decide to override the common global MAC address for all
• Be sure that the BVI network address is being advertised by running static or dynamic routing on the

Restrictions for Configuring IRB

Before configuring IRB, consider these restrictions:
• Only one BVI can be configured in any bridge domain.
• The same BVI can not be configured in multiple bridge domains.
• The following areas are not supported on the Layer2 bridging (with BVI):
A BVI will be moved to the Down state if all of the bridge ports (Ethernet flow points
Note
[EFPs]) associated with the bridge domain for that BVI are down. However, the BVI
will remain up if at least one bridgeport is up, even if all EFPs are down.
◦ The bridge-domain is in Up state.
◦ The BVI IP address is not in conflict with any other IP address on another active interface in the
router.
(BVI).
BVIs.
BVI interface.
◦ Access Control Lists (ACLs). However, Layer 2 ACLs can be configured on each Layer 2 port of
the bridge domain.
◦ Static mac entry configuration in Bridge.
◦ Mac ageing configuration at global config mode.
◦ MAC Learning Disable.
◦ Port-channel sub-interface as bridge member.
◦ Physical sub-interface as bridge member.
Interface and Hardware Component Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.1.x

Prerequisites for Configuring IRB

79