07-10-2019 02:04 AM
Hi All,
I was enabled the ip route in one of the core switch as below.
ip route X.X.X.X 255.255.255.255 X.X.X.X name SSA track 123
ip route X.X.X.X 255.255.255.255 X.X.X.X name SSA track 123
What is the purpose of track 123 here ?
Thanks.
Solved! Go to Solution.
07-10-2019 02:58 AM
Hello Satish,
the track 123 is a reference to tracking object 123.
Depending on the configuration of the track 123 object it it will be TRUE or FALSE when a monitored object like an IP SLA is in state up or down. Usually when the monitored object is up the track is TRUE.
If the monitored object fails the track 123 becomes FALSE and both the static routes that refer track123 will be removed from the IP routing table.
This kind of configuration allows for failover over backup static routes when the tracked object fails (typically an IP SLA).
Look in the configuration for finding the configuration of the track 123.
Hope to help
Giuseppe
07-10-2019 04:46 AM
Hello Satish,
show cdp neighbors show the neighbor devices directly connected to your router or switch that speak CDP protocol (Cisco devices or third party IP phones or Cisco SW ip phone running on a PC).
CDP works at OSI layer2.
show ip arp
provides the mapping between IP addresses of connected IP subnets and their respective MAC addresses according to ARP protocol.
ARP provides information to map OSI Layer 3 (IP address) to OSI layer 2 info (MAC address)
A PC connected via a switch to a router can have an ARP entry, but it is not a CDP neighbor on the router.
So the two commands provide different information.
Hope to help
Giuseppe
07-10-2019 02:57 AM
Hello,
tracking is typically used in conjunction with an IP SLA. Do you have one in your configuration (post the full config in case you are not sure).
07-10-2019 02:58 AM
Hello Satish,
the track 123 is a reference to tracking object 123.
Depending on the configuration of the track 123 object it it will be TRUE or FALSE when a monitored object like an IP SLA is in state up or down. Usually when the monitored object is up the track is TRUE.
If the monitored object fails the track 123 becomes FALSE and both the static routes that refer track123 will be removed from the IP routing table.
This kind of configuration allows for failover over backup static routes when the tracked object fails (typically an IP SLA).
Look in the configuration for finding the configuration of the track 123.
Hope to help
Giuseppe
07-10-2019 04:19 AM
07-10-2019 04:46 AM
Hello Satish,
show cdp neighbors show the neighbor devices directly connected to your router or switch that speak CDP protocol (Cisco devices or third party IP phones or Cisco SW ip phone running on a PC).
CDP works at OSI layer2.
show ip arp
provides the mapping between IP addresses of connected IP subnets and their respective MAC addresses according to ARP protocol.
ARP provides information to map OSI Layer 3 (IP address) to OSI layer 2 info (MAC address)
A PC connected via a switch to a router can have an ARP entry, but it is not a CDP neighbor on the router.
So the two commands provide different information.
Hope to help
Giuseppe
07-10-2019 09:23 PM
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