This guide provides instructions for configuring EtherChannel on Layer 3 ports of Cisco 1900, 2900, and 3900 Series Integrated Services Routers Generation 2.
This document describes how to configure EtherChannels on Layer 3 ports for Cisco 1900, 2900, and 3900 Series Integrated Services Routers (ISRs). The EtherChannel feature allows multiple physical Ethernet links to be combined into one logical link, providing fault-tolerant high-speed connections between switches, routers, and servers. It ensures automatic recovery by redistributing traffic across remaining links if a segment fails.
The purpose is to provide redundancy between the ISR and another device, not to provide scalable bandwidth.
Negotiation protocol PAgP and LACP are not supported; all physical ports must be configured manually.
Each EtherChannel can consist of up to four compatibly configured physical ports.