Cisco Catalyst 4500 Series Software Configuration Guide

40-18
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 40 Configuring Bidirection Forwarding Detection
Configuration Examples for Bidirectional Forwarding Detection
In this example, the EIGRP network contains SwitchA, SwitchB, and SwitchC. Gigabit Ethernet
interface 6/1 on SwitchA is connected to the same network as Gigabit Ethernet interface 6/1 on SwitchB.
Gigabit Ethernet interface 6/1 on SwitchB is connected to the same network as Gigabit Ethernet interface
6/1 on SwitchC.
SwitchA and SwitchB are running BFD Version 1, which supports echo mode, and SwitchC is running
BFD Version 0, which does not support echo mode. We would say that the BFD sessions between
SwitchC and its BFD neighbors are running echo mode with asymmetry. This is because echo mode will
run on the forwarding path for RouteA and SwitchB, and their echo packets will return along the same
path for BFD sessions and failure detections, while their BFD neighbor SwitchC runs BFD Version 0
and uses BFD controls packets for BFD sessions and failure detections.
Figure 40-3 shows a large EIGRP network with several switches, three of which are BFD neighbors that
are running EIGRP as their routing protocol.
Figure 40-3 EIGRP Network with Three BFD Neighbors Running V1 or V0
The example, starting in global configuration mode, shows the configuration of BFD.
Configuration for SwitchA
interface GigabitEthernet6/2
no switch
ip address 10.4.9.14 255.255.255.0
!
interface GigabitEthernet6/1
no switchport
ip address 172.16.1.1 255.255.255.0
bfd interval 100 min_rx 50 multiplier 3
no shutdown
!
router eigrp 11
network 172.16.0.0
bfd all-interfaces
auto-summary
!
ip default-gateway 10.4.9.1
ip default-network 0.0.0.0
ip route 0.0.0.0 0.0.0.0 10.4.9.1
ip route 172.16.1.129 255.255.255.255 10.4.9.1
!
Configuration for SwitchB
!
RouterA
GigabitEthernet 6/1 GigabitEthernet 6/1
Gigabit Ethernet 6/1172.16.1.2
172.16.1.1 172.16.1.3
RouterC
RouterB
347648
Gigabit Ethernet 6/2
Gigabit Ethernet 6/2
Gigabit Ethernet 6/2
Gigabit Ethernet 6/2

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E