Custom Queuing and Routing Updates

Document ID: 13784

Questions

Introduction
If custom queuing has been configured, do routing protocol updates such as Link-State Advertisements (LSAs) for Open Shortest Path First (OSPF) and broadcasts for Routing Information Protocol (RIP) and Interior Gateway Routing Protocol (IGRP) get queued in the special system queue 0, or do they get queued in the IP queue?
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Related Information

Introduction

This document provides information to answer a question about custom queuing and routing updates.

Q. If custom queuing has been configured, do routing protocol updates such as Link-State Advertisements (LSAs) for Open Shortest Path First (OSPF) and broadcasts for Routing Information Protocol (RIP) and Interior Gateway Routing Protocol (IGRP) get queued in the special system queue 0, or do they get queued in the IP queue?

A. In addition to low level keepalives, some protocols -- whose traffic is originated by the router -- use queue 0 for their time critical packets. Specifically:

ISO IGRP hellos

ESIS hellos

ISIS hellos

DECnet hellos

SLARP address resolution

EIGRP hellos

OSPF hellos

Router syslog messages

Spanning tree keepalives