Ping Latency from Server to Cisco 4500

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jabirp

Honorable
Jun 28, 2012
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10,520
Hi All,

We have a network of 4 Servers and IP cameras, also Workstations.
This is connecting through Cisco 4500 Switch. Edge switches, where IP cameras are connected are Comnet Switches.

1. Ping from Cisco 4500 to Server and back, there is delays like 10-20 sec.
2. Ping from Server to IP cameras are 10-20 ms.
3. Ping from Workstation to cameras and back, are <1 ms.
4. Ping from Workstation to Cisco 4500 and back, are <1 ms.


All the devices are connected through this 4500 single switch. All the Devices are working in Single VLAN. IP cameras are working fine. But I am worried about this delay between server and switch.

Why the ping between Server and Switch delays here?

Thanks for the help.

Jabir
 
Solution
B
The 4500 is a very complex device but you are running it as a stupid layer 2 switch so it is strange you would see even the 10ms ping times to the cameras.

I would be suspect it is the server since the switch is not doing much and it is wire speed so it will not delay the traffic....I am assuming you do not have any fancy traffic policy applied to the interfaces.

I would load wireshark on the sever and try to determine where the delay is. There is not much too it. You will see the server send a ARP for the mac address of the switch ip. It will get a reply. It then sends a ICMP message and gets a reply. You need to see the delays between each of these to determine which device is causing the delays.

I would be suspect...
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B

bill001g

Titan
Aug 9, 2012
28,318
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The 4500 is a very complex device but you are running it as a stupid layer 2 switch so it is strange you would see even the 10ms ping times to the cameras.

I would be suspect it is the server since the switch is not doing much and it is wire speed so it will not delay the traffic....I am assuming you do not have any fancy traffic policy applied to the interfaces.

I would load wireshark on the sever and try to determine where the delay is. There is not much too it. You will see the server send a ARP for the mac address of the switch ip. It will get a reply. It then sends a ICMP message and gets a reply. You need to see the delays between each of these to determine which device is causing the delays.

I would be suspect of a duplicate ip address or some issue with mac addresses. If you were doing something like VRRP and had multiple switches you can get strangeness when it isn't configure right but your install is simplistic.
 
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Solution
J

jabirp

Honorable
Jun 28, 2012
13
0
10,520
Hi Bill,

This network was in place when we got the work and I have suggested them to make it Layer-3 by splitting.
But our Client don't want any changes in the system, only to solve any issues found. Even they don't know about this delays, because this is not effecting our VMS function yet. I was just curious to find the reason.

Thanks for the suggestion you have made. Will try with Wireshark and see what is causing the delay.

Regards,

Jabir





 
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