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Catalyst 3750-X and Catalyst 3560-X Switch Software Configuration Guide, Cisco IOS Release 15.0(2)SE and Later
Catalyst 3750-X and Catalyst 3560-X Switch Command Reference, Cisco IOS Release 15.0(2)SE and Later

IOS and NX-OS Software – IOS – IOS Software Release 15M&T – IOS 15.3M&T
Configuration Guides
Command References



Configuring VLANs

Managing vlan.dat in Cisco Catalyst Switches Running Cisco IOS Software

Configuring VTP

Configuring Private VLANs

Configuring EtherChannels and Link-State Tracking

Understanding EtherChannel Inconsistency Detection

Configuring STP

Understanding and Tuning Spanning Tree Protocol Timers

Configuring Optional Spanning-Tree Features

Configuring MSTP

Understanding Rapid Spanning Tree Protocol (802.1w)

Understanding Multiple Spanning Tree Protocol (802.1s)

Configuring CDP

Configuring LLDP, LLDP-MED, and Wired Location Service

Configuring UDLD

Administering the Switch

Configuring SPAN and RSPAN

Configuring ERSPAN


Configuring Fallback Bridging

Configuring Voice VLANs

Configuring Smartports Macros

Spanning-Tree Protocol Enhancements using Loop Guard and BPDU Skew Detection Features


Troubleshooting Serial Line Problems

HDLC Back-to-Back Connections

ISDN DDR Using HDLC Encapsulation

Understanding debug ppp negotiation Output

Troubleshooting PPP (CHAP or PAP) Authentication

トラブルシューティング:PPP(CHAP または PAP)認証

Configuring and Troubleshooting PPP Password Authentication Protocol (PAP)

PPP CHAP 認証の説明と設定

PPP over Ethernet Client

A Method for Transmitting PPP Over Ethernet (PPPoE)


Configuring IPv4 Addresses

IP Addressing and Subnetting for New Users

Address Resolution Protocol

What Is Administrative Distance?

Route Selection in Cisco Routers

Adjust Administrative Distance for Route Selection in Cisco IOS Routers Configuration Example

Configuring IP Routing Protocol-Independent Features

Specify a Next Hop IP Address for Static Routes

Static Routes With Next Hop As An Exit Interface Or An IP Address

Configuring a Gateway of Last Resort Using IP Commands

Configuring Basic Cisco Express Forwarding

Understanding Cisco Express Forwarding (CEF)

DDR Backup using BRIs and the Backup Interface Command

Configuring Cisco IOS IP SLAs Operations

Configuring Enhanced Object Tracking

Policy-Based Routing

Policy-Based Routing Default Next-Hop Routes

PBR Support for Multiple Tracking Options

PBR Match Track Object

ip local policy route-map

How GRE Keepalives Work

How to configure a GRE tunnel

Why Can’t I Browse the Internet when Using a GRE Tunnel?

GRE Tunnel Interface States and What Impacts Them

The “%TUN-5-RECURDOWN” Error Message and Flapping EIGRP/OSPF/BGP Neighbors Over a GRE Tunnel

Configuring On-Demand Routing

Multi-VRF Support (VRF Lite)

VPN Routing and Forwarding (VRF)-Lite Software Configuration Guide for Cisco 1000 Series Connected Grid Routers (Cisco IOS)

Bidirectional Forwarding Detection

Configuring Basic Performance Routing

パフォーマンス ルーティングと設定例

IPv6 Unicast Routing

Understanding IPv6 EUI-64 Bit Address

IPv6 Neighbor Discovery

IPv6 Stateless Autoconfiguration

Understand “include-connected” keyword use in IPv6 redistribution

IPv6 ACL Extensions for Hop by Hop Filtering

NAT-PT for IPv6

IPv6 Routing: Multiprotocol BGP Extensions for IPv6

IPv6 Tunnel through an IPv4 Network

Implementing Tunneling for IPv6

IPv6 Generic Prefix

Default Passive Interfaces

Filtering Routing Updates on Distance Vector IP Routing Protocols

Redistributing Routing Protocols

Configuring Routing Information Protocol

IPv6 Routing: RIP for IPv6

IPv6 Routing: Route Redistribution


Enhanced Interior Gateway Routing Protocol


EIGRP Wide Metrics

How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?

Add Path Support in EIGRP

IP EIGRP Route Authentication

EIGRP/SAF HMAC-SHA-256 Authentication

EIGRP Stub Routing

EIGRP Loop-Free Alternate Fast Reroute


EIGRP Support for Route Map Filtering

EIGRP Prefix Limit Support

Configuring a Gateway of Last Resort Using IP Commands

Preventing Duplicate EIGRP Router IDs

EIGRP Route Tag Enhancements

EIGRP Over the Top

Troubleshoot Common EIGRP Issues

IPv6 Routing: EIGRP Support

Implementing EIGRP for IPv6


OSPF Design Guide

Configuring OSPF

Problems with Running OSPF in NBMA and Broadcast Mode over Frame Relay

OSPF: Frequently Asked Questions

OSPF Neighbor States

OSPF Area Transit Capability

OSPF Virtual Link

OSPFv2 Cryptographic Authentication

Configuring OSPF Authentication on a Virtual Link

OSPF Not-So-Stubby Area (NSSA)

OSPF Inbound Filtering Using Route Maps with a Distribute List

OSPF ABR Type 3 LSA Filtering

OSPF Forwarding Address Suppression in Translated Type-5 LSAs

Common Routing Problem with OSPF Forwarding Address

How Does OSPF Generate Default Routes?

OSPF reliable conditional default routing

OSPF Support for Fast Hello Packets

OSPF Shortest Path First Throttling

OSPF Link-State Advertisement Throttling

OSPF Update Packet-Pacing Configurable Timers

OSPFv2 Loop-Free Alternate Fast Reroute

OSPF Stub Router Advertisement

Why OSPF Demand Circuit Keeps Bringing Up the Link

OSPF Mechanism to Exclude Connected IP Prefixes from LSA Advertisements

OSPF Limit on Number of Redistributed Routes

OSPF Incremental SPF

IPv6 Routing: OSPFv3

Chapter: Configuring OSPFv3

Prefix Suppression Support for OSPFv3

OSPFv3 Virtual Link Configuration Example

IPv6 Routing: OSPFv3 Authentication Support with IPsec

OSPFv3 Address Families

TTL Security Support for OSPFv3 on IPv6


BGP Case Studies

Sample Configuration for iBGP and eBGP With or Without a Loopback Address

MD5 Authentication Between BGP Peers Configuration Example

Configuring BGP Neighbor Session Options

BGP Support for TTL Security Check

BGP Support for 4-byte ASN

BGP Multisession

BGP Dynamic Neighbors

Configuring Internal BGP Features

BGP-Multiple Cluster IDs

BGP: Frequently Asked Questions

BGP Support for Next-Hop Address Tracking

BGP の Next-Hop Tracking の動作について

Understanding Redistribution of OSPF Routes into BGP

Configuring and Verifying the BGP Conditional Advertisement Feature

BGP Conditional Route Injection

BGP Best Path Selection Algorithm

How BGP Routers Use the Multi-Exit Discriminator for Best Path Selection

BGP Link Bandwidth

Understanding Route Aggregation in BGP

Block One or More Networks From a BGP Peer

Configuring a Basic BGP Network

Regular Expressions

Using Regular Expressions in BGP

BGP Prefix-Based Outbound Route Filtering

BGP 4 Soft Configuration

Configuring the BGP Local-AS Feature

Removing Private Autonomous System Numbers in BGP

Sample Configuration for Removing Private AS Numbers in BGP

Allowas-in Feature in BGP Configuration Example

Understanding BGP AS-Override Feature

BGP fast-external-fallover Command Overview

BGP PIC Edge for IP and MPLS-VPN

BGP Additional Paths

IPv6 Routing: Multiprotocol BGP Extensions for IPv6

Multiprotocol BGP for IPv6 Configuration Example

Redistributing Routing Protocols

IS-IS Overview and Basic Configuration


Multi-VRF Support (VRF Lite)

VRF-Lite の設定

MPLS Label Distribution Protocol (LDP)

MPLS Virtual Private Networks

Verifying Connectivity with MPLS LSP Ping and Traceroute

Configuring MPLS LDP Label Filtering

Multiprotocol BGP MPLS VPN

MP-EBGP Configuration Example

MPLS VPN import/export maps

Configuring MPLS Basic VPN with RIP on Customer Side


Chapter: MPLS VPN OSPF PE and CE Support

OSPF Sham-Link Support for MPLS VPN

MPLS VPN Support for EIGRP Between PE and CE

EIGRP MPLS VPN PE-CE Site of Origin (SoO)

Internet Access from an MPLS VPN Using a Global Routing Table

Providing Internet Access for MPLS L3 VPNs

Route Leaking in MPLS/VPN Networks

Any Transport over MPLS

ISC レイヤ 2 VPN の概念

VPN への ID 番号の割り当て

Assigning an ID Number to a VPN

An Introduction to IP Security (IPSec) Encryption

Configuration Professional: Site-to-Site IPsec VPN Between Two IOS Routers Configuration Example

IPsec Troubleshooting: Understanding and Using debug Commands

GRE over IPSecVPN を用いた LAN-to-LAN 接続設定例

IPsec Virtual Tunnel Interface

Cisco Group Encrypted Transport VPN

Dynamic Multipoint VPN(DMVPN)デザイン ガイド(バージョン 1.1)

DMVPNを用いたフルメッシュIPSec VPN接続設定例

Dynamic Multipoint IPsec VPN(マルチポイント GRE/NHRP を使用した IPsec VPN のスケーリング)

Most Common DMVPN Troubleshooting Solutions

Configuring NHRP

NHRP の設定

Shortcut Switching Enhancements for NHRP in DMVPN Networks

Configure Phase-3 Hierarchical DMVPN with Multi-Subnet Spokes


Configuring IGMP Snooping and MVR

Customizing IGMP

Configuring IGMP Proxy

Configuring Basic IP Multicast

Configuring a Rendezvous Point

Configuring IP Multicast Routing

AutoRP Enhancement

PIM Auto-RP Behavior with Other RP Distribution Techniques in SM Domain Configuration Example

How to Implement a Filtering Policy for Rendezvous Points

Rendezvous Point Engineering

Configuring Source Specific Multicast

Anycast RP

Using MSDP to Interconnect Multiple PIM-SM Domains

Multicast Source Discovery Protocol SA Filter Recommendations

Basic Multicast Troubleshooting Tools

IP Multicast Troubleshooting Guide

IP マルチキャストのトラブルシューティング ガイド

Configuring an IP Multicast Static Route

Configuring Multiprotocol BGP Extensions for IP Multicast

Using IP Multicast Over Frame Relay Networks

Multicast over a GRE Tunnel

Configuring Basic IP Multicast in IPv6 Networks

IPv6 Multicast: PIM Sparse Mode

IPv6 Multicast Listener Discovery Protocol

IPv6 Multicast using BSR(Bootstrap router)

IPv6 マルチキャストの実装


Understanding and Tuning the tx-ring-limit Value

Configuring Weighted Fair Queueing

Understanding Selective Packet Discard (SPD)


Understanding Data Compression

WAN Compression FAQs

Header Compression

Configuring RTP Header Compression

Configuring TCP Header Compression

Configuring Link Fragmentation and Interleaving for Multilink PPP

QOS を実装した PPP リンク上での VoIP(LLQ / IP RTP プライオリティ、LFI、cRTP)

Classifying Network Traffic

Marking Network Traffic

Class-Based Weighted Fair Queueing and Weighted Random Early Detection

Comparing the bandwidth and priority Commands of a QoS Service Policy

Low Latency Queueing with Priority Percentage Support

Congestion Avoidance Overview

Configuring Weighted Random Early Detection

WRED-Explicit Congestion Notification

Policing and Shaping Overview

Regulating Packet Flow on a Per-Interface Basis Using Generic Traffic Shaping

Percentage-Based Policing and Shaping Based on Bandwidth


Traffic Policing

Single-Rate Color Marker for Traffic Policing

Modular QoS CLI Three-Level Hierarchical Policer

Two-Rate Policer

QOS question Shape peak and Shape average

Configuring Class-Based RTP and TCP Header Compression

Configuring Header Compression Using IPHC Profiles

Frame Relay Voice-Adaptive Traffic Shaping and Fragmentation

Classifying Network Traffic Using NBAR

Cisco 12000シリーズインターネットルータでのMDRRとWREDの説明と設定

Quality of Service Options on GRE Tunnel Interfaces


Configuring Port-Based Traffic Control

Configuring Private VLANs

Configuring Network Security with ACLs

Block ARP Packets with Use of MAC Access Lists and VLAN Access Maps on Catalyst 2970, 3550, 3560, and 3750 Series Switches

Configuring Port-Based Traffic Control

Configuring DHCP Features and IP Source Guard

Configuring Dynamic ARP Inspection

Configuring IEEE 802.1x Port-Based Authentication

Configuring Basic AAA on an Access Server

Configuring Authentication

Configuring Authorization

Cisco IOS Login Enhancements-Login Block

Cisco IOS Resilient Configuration

Cisco IOS Resilient Configuration(日本語)

Role-Based CLI Access


ICMP Unreachable Destination Counters

Internet Control Message Protocol (ICMP) Parameters

Control Plane Policing

コントロール プレーン保護

Control Plane Protection

Configuring IP Access Lists

Configuring IPv6 ACLs

Access Control Lists and IP Fragments

Lock-and-Key: Dynamic Access Lists

Configuring IP Services

Configuring Unicast Reverse Path Forwarding

Unicast Reverse Path Forwarding Loose Mode


Configuring TCP Intercept (Preventing Denial-of-Service Attacks)

Standard IP Access List Logging

IP Source Tracker

ACL IP Options Selective Drop

Flexible Packet Matching

IPv6 RA Guard


IPv6 First-Hop Security Binding Table

IPv6 Device Tracking

IPv6 Neighbor Discovery Inspection

IPv6 Source Guard and Prefix Guard

IPv6 PACL Support


Configuring Secure Shell

Telnet および SSH のポート番号変更方法

HTTP 1.1 Web Server and Client

Configuring SNMP

CPU しきい値通知の設定


Configuring System Message Logging and Smart Logging

コンフィギュレーション変更通知およびロギ ング

IP Access List Overview


Administering the Switch

Implementing NTPv4 in IPv6

Embedded Event Manager Overview

Writing Embedded Event Manager Policies Using the Cisco IOS CLI

AutoInstall Using DHCP for LAN Interfaces

Using AutoInstall and Setup

Managing Connections Menus and System Banners

service tcp-keepalives を使用してハングした Telnet のセッションをクリアする方法

Creating Core Dumps


Configuring CDP


Configuring Enhanced Object Tracking

Configuring HSRP and VRRP

Configuring VRRP

Configuring GLBP

Configuring the Cisco IOS DHCP Server

DHCP Client

Configuring the Cisco IOS DHCP Relay Agent

Configuring the DHCP Server On-Demand Address Pool Manager

Configuring DHCP Enhancements for Edge-Session Management

IPv6 クライアント IP アドレス ラーニングの設定

DHCPv6 Server Stateless Autoconfiguration

IPv6 Access Services:Stateless DHCPv6

IPv6 Access Services: DHCPv6 Prefix Delegation

Configuring DNS

DNS の設定




Cisco Network Address Translation(NAT; ネットワーク アドレス変換)に関する FAQ


Using NAT in Overlapping Networks


Configuring NAT for IP Address Conservation



NAT Virtual Interface aka NVI, what is that?!

Using Application-Level Gateways with NAT

Configuring IP Services

Cisco IOS NetFlow Overview

Getting Started with Configuring Cisco IOS NetFlow and NetFlow Data Export

Configuring NetFlow and NetFlow Data Export

Configuring NetFlow Top Talkers using Cisco IOS CLI Commands or SNMP Commands

Configuring NetFlow Aggregation Caches

Using NetFlow Filtering or Sampling to Select the Network Traffic to Track

Address Resolution Protocol

Configuring IRDP


Configuring IPv4 Broadcast Packet Handling

Configuring UDP Forwarding Support for IP Redundancy Virtual Router Groups

Enabling Protocol Discovery

IP Event Dampening

IP Event Dampening

Embedded Packet Capture

DRP Server Agent の設定