A case of dual-machine hot backup and EIGRP routing adjustment on low-end routers

This is a practical case:

1. HSRP configuration:

On the Longquan-backup (1601):

int e0
ip address 22.97.80.253 255.255.255.0 secondary
ip address 21.97.80.253 255.255.255.0
no ip redirects
no logging event subif-link-status
standby priority 200
standby preempt
standby ip 21.97.80.1
standby ip 22.97.80.1 secondary
standby track Serial0 100/如果S0口的线路当掉了，该E口的优先权减小100，从而成为STANDBY状态

On the Longquan (2501):

int e0
ip address 22.97.80.254 255.255.255.0 secondary
ip address 21.97.80.254 255.255.255.0
no ip redirects
no ip directed-broadcast
standby priority 150
standby preempt
standby ip 21.97.80.1
standby ip 22.97.80.1 secondary

2.LongQuan (2500) on-Road adjustment:

interface Serial1.16 point-to-point
description --- 256K LianTong FR ---
ip address 22.96.229.2 255.255.255.252
ip accounting output-packets
bandwidth 1000000/调高接口带宽
frame-relay interface-dlci 16

router eigrp 1
redistribute connected
redistribute sta
network 21.0.0.0
network 22.0.0.0
distribute-list 22 out Ethernet0/过滤掉21的低METRIC值EIGRP路由
no auto-summary
!
access-list 22 permit 22.0.0.0 0.255.255.255

Description: Normal time, 1601 is the local area network two network segment of the active gateway, the destination of the LAN 22 segment of the data to go Unicom line, 21 network segment of the telecommunications line; When 1601 s port down, 25 main gateway, all the data are going to the Unicom line