BGP Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

BGP DMZ Bandwidth Management

Updated: February 28, 2026

Overview

Describes BGP DMZ bandwidth management features including aggregate bandwidth, link bandwidth for unequal cost recursive load balancing, and transitive-bandwidth extended community support to optimize routing decisions and traffic distribution.

You will learn how these BGP DMZ bandwidth features improve routing efficiency and traffic distribution across DMZ links.

BGP DMZ aggregate bandwidth

Describes how BGP aggregates link-bandwidth values of DMZ eBGP multipaths when advertising routes to iBGP peers, enabling accurate internal bandwidth representation for improved routing decisions.

Removal of link-bandwidth extended community to iBGP peers

Explains the removal of link-bandwidth extended community to iBGP peers to minimize exposure of DMZ community parameters and enable proportional traffic distribution over multiple iBGP paths.

BGP DMZ link bandwidth for unequal cost recursive load balancing

Describes support for unequal cost load balancing for recursive prefixes using BGP DMZ link bandwidth to distribute traffic based on link capacity.

BGP DMZ link bandwidth enhancement

Describes enhancements that allow BGP to advertise any valid DMZ link bandwidth value with improved precision, including values less than 1 kbps, for accurate bandwidth signaling.

BGP DMZ transitive-bandwidth extended community support

Describes support for processing DMZ transitive-bandwidth extended communities in BGP to enable bandwidth-aware routing decisions using UCMP and multivendor interoperability.

Policy-based cumulative bandwidth advertisements

Explains the functionality of policy-based cumulative bandwidth advertisements and describes how they enable selective cumulation, suppression of minor changes, local domain boundary control, bandwidth rounding, and policy-driven outbound actions.

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