BGP communities let you attach policy metadata to routes across your entire network. This guide covers standard, extended, and large communities on Cisco IOS-XE — with real CLI examples for tagging, filtering, RTBH blackholing, and a complete dual-homed enterprise policy configuration.
BGP communities let you carry policy intent alongside your routes — tag once, match everywhere. This guide covers community configuration, route filtering with prefix-lists and AS-path filters, remotely triggered blackholing (RTBH), large communities, and production best practices with real IOS-XE CLI examples.
Most enterprise networks still run dual-stack at best in 2026. This guide covers full IPv6 deployment on Cisco IOS-XE: addressing, OSPFv3, DHCPv6, ACLs, BGP, and the verification commands that actually tell you what’s broken — with real CLI output and production gotchas.
Cisco’s Embedded Event Manager (EEM) is one of the most underutilized features in IOS-XE. This guide covers six practical EEM applets — from BGP peer monitoring and interface flap detection to nightly config backups and CPU spike capture — with real CLI syntax and Cat9K-specific tips.
BGP is the glue that holds the internet together — learn how it works, how to configure it on Cisco, and the security challenges it faces.
