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Unified Load Balancer Configuration and Administration Guide, Release 2026.02

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Unified Load Balancer Configuration and Administration Guide, Release 2026.02

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About this document

Introduction to Unified Load Balancer

ULB overview
ULB key features and capabilities
Benefits of using ULB
Limitations

ULB deployment architecture

Key components of ULB

Getting started

Requirements
Initial configurations for on-premise deployment

Deploy and configure ULB through Ops center

ULB Ops center
Prerequisites for ULB deployment
Deploy the ULB
Access the ULB Ops center

Unified Load Balancer traffic distribution

How the ULB works

ULB features and configuration

Resilience and traffic convergence via BGP and BFD
Neighbor discovery
Core dump generation
Service outbound route (SOR)
Support for data path metrics based on eBPF
Miscellaneous configurations

Performance metrics and KPIs

ULB operator metrics
ULB agent metrics

Sample custom resource definitions for load balancer and egress management policy

Load balancer CR (IPv4)
Load balancer CR (IPv6)
Egress management policy CR for stateful pods (IPv4)
Egress management policy CR for stateful pods (IPv6)
Egress management policy CR for stateless pods (IPv4)
Egress management policy CR for stateless pods (IPv6)
Egress management policy CR for stateful pods without port ranges (IPv4)
Service outbound route (SOR) IPv4
Service outbound route (SOR) IPv6

Unified Load Balancer Configuration and Administration Guide, Release 2026.02

Getting started

Updated: April 23, 2026

Overview

Explains how to get started with technical implementation and operations, including requirements and initial configurations for on-premise deployment.

Requirements

Provides the requirements and summarizes key parameters and reference information for ULB deployment. It covers system prerequisites to ensure optimal performance and compatibility.

Initial configurations for on-premise deployment

Provides the initial configurations required for on-premise deployment, including installing Cilium CNI, enabling Isovalent BGP and BFD CRDs, enabling Isovalent egress-gateway CRD, and configuring the load balancer algorithm.

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The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.