06-13-2013 06:40 AM - edited 03-04-2019 08:11 PM
Hello,
I nornally track an interface line protocol when I set up HSRP, but today I noticed a router trackign "sla 1" what is this as there is no reference to it anywhere else in the config:
track 1 ip sla 1
!
interface GigabitEthernet0/1
ip address 172.30.22.10 255.255.255.0
standby 1 ip 172.30.22.1
standby 1 priority 110
standby 1 preempt
standby 1 track 1 decrement 10
duplex full
speed 100
Thanks
06-13-2013 06:49 AM
It has been my experience that tracking interface protocol works well when the interface is point to point serial but generally does not work well when the interface is Ethernet. There are lots of circumstances where you do not really have connectivity out the Ethernet interface but the interface line protocol is still up. So tracking some object is a way to detect whether the interface is really working. The syntax of configuring the track has changed a bit in various versions of IOS. I suspect that if you would post the complete config that we would be able to show you where the sla is configured.
HTH
Rick
06-13-2013 07:16 AM
Sure thing:
version 15.1
no service pad
service timestamps debug datetime
service timestamps log datetime
service password-encryption
!
hostname *
!
boot-start-marker
boot-end-marker
!
!
logging buffered 4096
enable secret
!
no aaa new-model
clock summer-time BST recurring last Sun Mar 2:00 last Sun Oct 3:00
!
no ipv6 cef
ip source-route
ip cef
!
!
!
!
!
ip flow-cache timeout active 1
login on-failure log
login on-success log
multilink bundle-name authenticated
!
crypto pki token default removal timeout 0
!
!
!
!
username *
!
!
!
track 1 ip sla 1
!
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
bandwidth 20000
ip address 172.118.33.42 255.255.255.252
ip flow ingress
ip flow egress
duplex full
speed 100
!
interface GigabitEthernet0/1
ip address 172.30.22.10 255.255.255.0
standby 1 ip 172.30.2.1
standby 1 priority 110
standby 1 preempt
standby 1 track 1 decrement 10
duplex full
speed 100
!
!
router eigrp 191
network 172.118.33.40 0.0.0.3
network 172.30.22.0 0.0.0.255
network 172.30.102.0 0.0.0.255
redistribute static
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
ip flow-export source GigabitEthernet0/0
ip flow-export version 5
ip flow-export destination 192.168.1.249 9996
!
ip route 172.30.102.0 255.255.255.0 172.30.2.2
!
logging trap notifications
logging source-interface GigabitEthernet0/1
logging 192.168.8.129
access-list 23 permit 192.168.9.11
access-list 23 permit 172.118.33.40 0.0.0.3
access-list 64 permit 192.168.8.129
!
!
snmp-server community m0ghjr RO 64
!
control-plane
!
!
banner login ^C ########## WARNING - You must have authorisation to use this system. ##########
Unauthorised access to or misuse of this system constitutes a criminal offence under the 1990 Computer Misuse Act.
Use of the system may be logged without further notice and the resulting logs may be used as evidence in court.
^C
!
line con 0
password
login local
transport output all
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
access-class 23 in
exec-timeout 5 0
password
login local
transport input telnet
transport output all
!
scheduler allocate 20000 1000
end
06-13-2013 07:42 AM
Hello Andy,
can you post output of #show track
I think that track 1 ip sla 1 is refering to not existing ip sla configuration, it would be probably some forgotten command after some change.
I assume that track state will be UP and it will not have any impact on HSRP.
Solution:
no track 1 ip sla 1
no standby 1 track 1 decrement 10
Best Regards
Please rate all helpful posts and close solved questions
06-13-2013 07:50 AM
Here you go
#show track
Track 1
IP SLA 1 state
State is Down
3 changes, last change 28w6d
Latest operation return code: 8-8-8-8
Tracked by:
HSRP GigabitEthernet0/1 1
06-13-2013 07:47 AM
Thanks for posting the config. I was confident that we could show you where the object to track was configured. And I was wrong
It does look like there was object tracking configured at one time and that it has been removed.
HTH
Rick
06-13-2013 08:46 AM
@andy
SLA probes help track the interface in regard to FHRP's
even to track the redundant interfaces SLA's work as far as i know
the decreament helps to lower the priority of the down router so that the standby one can take over as active
06-13-2013 08:52 AM
Before any changes are made we should do a 'show standby'
Here we should be able to see the decrement of 10 from the original priority configured. Since Tracking is down state (because no ip sla is configured) this will be a good observation to make before any changes IMHO.
PS what happened 28 weeks ago, what were the configurations then and now. Can we compare?
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