Troubleshoot HSRP

6
R1：

interface Ethernet0/0
 ip address 10.10.1.2 255.255.255.0
 standby 1 ip 10.10.1.1
!
interface Ethernet0/1
 ip address 10.1.1.2 255.255.255.252

R2：

interface Ethernet0/0
 ip address 10.10.1.3 255.255.255.0
 standby version 2
 standby 2 ip 10.10.1.1
!
interface Ethernet0/1
 ip address 10.1.1.6 255.255.255.0
!

R1#sh standby brief
Interface   Grp  Pri P State   Active        Standby         Virtual IP
Et0/0         1     100   Active  local          unknown       10.10.1.1


R2#sh standby brief

Interface   Grp  Pri P State   Active        Standby         Virtual IP

Et0/0         2     100   Active  local         unknown         10.10.1.1

R2(config)#int e0/0

R2(config-if)#standby 1 ip 10.10.1.1

% Address 10.10.1.1 in group 2

R2#

*Apr 15 18:52:36.981: %IP-4-DUPADDR: Duplicate address 10.10.1.1 on Ethernet0/0, sourced by 0000.0c07.ac01

R2(config-if)#no standby 2

R2(config)#int e0/0

R2(config-if)#standby 1 ip 10.10.1.1

R2#sh standby brief

Interface   Grp  Pri P State   Active          Standby         Virtual IP

Et0/0       1    100   Listen  unknown         unknown         10.10.1.1

R2#

*Apr 15 18:57:46.324: %HSRP-5-STATECHANGE: Ethernet0/0 Grp 1 state Standby -> Active

R2#

*Apr 15 18:57:46.334: %IP-4-DUPADDR: Duplicate address 10.10.1.1 on Ethernet0/0, sourced by 0000.0c07.ac01

R2#sh standby brief

Interface   Grp  Pri P State   Active          Standby         Virtual IP

Et0/0       1    100   Active  local           unknown         10.10.1.1

R1(config)#int e0/0

R1(config-if)#standby 1 priority 150
R1(config-if)#standby 1 preempt

R1#sh standby brief

Interface   Grp  Pri P State   Active          Standby         Virtual IP

Et0/0       1    150 P Active  local           unknown         10.10.1.1

R1#sh standby

Ethernet0/0 - Group 1

  State is Active

    2 state changes, last state change 00:22:29

  Virtual IP address is 10.10.1.1

  Active virtual MAC address is 0000.0c07.ac01

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 0.384 secs

  Preemption enabled

  Active router is local

  Standby router is unknown

  Priority 150 (configured 150)

  Group name is "hsrp-Et0/0-1" (default)

R2#sh standby

Ethernet0/0 - Group 1 (version 2)

  State is Active

    2 state changes, last state change 00:01:48

  Virtual IP address is 10.10.1.1

  Active virtual MAC address is 0000.0c9f.f001

    Local virtual MAC address is 0000.0c9f.f001 (v2 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 0.192 secs

  Preemption disabled

  Active router is local

  Standby router is unknown

  Priority 100 (default 100)

  Group name is "hsrp-Et0/0-1" (default)

R2(config)#int e0/0

R2(config-if)#no standby version 2

R2(config-if)#do sh stand

Ethernet0/0 - Group 1

  State is Standby

    4 state changes, last state change 00:00:10

  Virtual IP address is 10.10.1.1

  Active virtual MAC address is 0000.0c07.ac01

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 0.528 secs

  Preemption disabled

  Active router is 10.10.1.2, priority 150 (expires in 8.816 sec)

  Standby router is local

  Priority 100 (default 100)

  Group name is "hsrp-Et0/0-1" (default)

R2(config-if)#do sh stand br

Interface   Grp  Pri P State   Active          Standby         Virtual IP

Et0/0       1    100   Standby 10.10.1.2       local           10.10.1.1

R1#sh standby b

Interface   Grp  Pri P State   Active          Standby         Virtual IP

Et0/0       1    150 P Active  local           10.10.1.3       10.10.1.1