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New Member

SG300-20-20 : ARP table not automatically updated

Hi,

I'm running on the firmware 1.3.5.58 on my cisco sg300-20-20 when connecting devices arp table is not dynamically updated.

The ports is put into forwarding but the macs of my devices do not get updated.

I have this for my printer, synology, dlink wireless access point.

After some reboots, write to memory commands the ARP table gets updated.

When I'm checking the interfaces I do get a lot of internal mac receive errors.

Any idea ? When I choose a non managed switch I do not encounter any issues.

Regards

Everyone's tags (3)
11 REPLIES
Green

SG300-20-20 : ARP table not automatically updated

Hi Jeroen, this is the 3rd time I've heard of this. I personally cannot recreate this symptom.

Here's an older post

https://supportforums.cisco.com/thread/2253770

If you could please provide the following

show tech from the switch

a network topology

brand of products you experience issue with

what software versions you've observed this behavior (only 1.3.5.58?)

If you're uncomfortable to post this information please email me at tmw0402@hotmail.com

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
New Member

SG300-20-20 : ARP table not automatically updated

Tom,

I have read this one but no clear solution came except replacing the switch.

When I do use the write command it fixes my issue but it can not be that each time a lose connectivity I need to connect to the switch and execute this command.

Jeroen

Green

SG300-20-20 : ARP table not automatically updated

Hi Jeroen, you are right there was not much good conversation on that post.

Can you please provide the information ask on my previous post?

Can you also provide other information such as-

Does it affect EVERYTHING you try to connect?

What happens if you set speed/duplex on the port?

What happens if you shut down and restart the port?

What happens if you disable spanning tree on the port?

What happens if you disable energy efficient ethernet on the port?

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
New Member

SG300-20-20 : ARP table not automatically updated

Tom,

Yes every device that connects through that access point. But none of those devices remains active forever :

iphones, ipads, laptop (shutdown) , airplay device

The other access point has the internet uplink and is default gateway for the switch so there is always traffic to that one.

Behavior:

When I connect via ssh :

1#write memory

Overwrite file [startup-config].... (Y/N)[N] ?Y

14-Jan-2014 17:33:06 %LINK-W-Down:  gi8, aggregated (78)

14-Jan-2014 17:33:06 %LINK-I-Up:  gi8, aggregated (78)

14-Jan-2014 17:33:06 %COPY-I-FILECPY: Files Copy - source URL running-config destination URL flash://startup-config

14-Jan-2014 17:33:07 %LINK-W-Down:  gi8, aggregated (3)

14-Jan-2014 17:33:07 %LINK-I-Up:  gi8, aggregated (3)

14-Jan-2014 17:33:10 %COPY-N-TRAP: The copy operation was completed successfully

Copy succeeded

1#14-Jan-2014 17:33:11 %STP-W-PORTSTATUS: gi8: STP status Forwarding

After some time the port went down again

dsys-bur1#14-Jan-2014 17:38:07 %LINK-W-Down:  gi8, aggregated (1019)

14-Jan-2014 17:38:07 %LINK-I-Up:  gi8, aggregated (1019)

14-Jan-2014 17:38:07 %LINK-W-Down:  gi8

14-Jan-2014 17:38:07 %LINK-I-Up:  gi8

14-Jan-2014 17:41:29 %LINK-W-Down:  gi8, aggregated (1131)

14-Jan-2014 17:41:29 %LINK-I-Up:  gi8, aggregated (1131)

14-Jan-2014 17:41:30 %AAA-I-CONNECT: New http connection for user cisco, source 192.168.1.3 destination 192.168.1.253 ACCEPTED

14-Jan-2014 17:41:30 %LINK-W-Down:  gi8

14-Jan-2014 17:41:30 %LINK-I-Up:  gi8

When  however the connection remains active , for example a wireless  connection from a laptop that is connected then the connection remains  active.

I'll try first the engergy settings of the port and will see if that makes any difference.

Green

SG300-20-20 : ARP table not automatically updated

Hi Jeroen, look at your information and how I read things, it seems when there is no traffic, your link goes down all together.

This is consistent to the energy efficient ethernet as it makes the port go to sleep after some time to converse power.

If this assessment is true then removing this feature should resolve your problem.

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
New Member

SG300-20-20 : ARP table not automatically updated

Tom,

Disabling the energy on each port solved the issue when new members are added that they became immediately active. Also non active ports were still usable after some time.

But only after a reboot I had again to initatie a write before everything became active

1#show arp

Total number of entries: 1

  VLAN    Interface     IP address        HW address          status

--------------------- --------------- ------------------- ---------------

vlan 1     gi18       192.168.1.3     xx:xx:xx:xx:xx:xx   dynamic

1#write memory

Overwrite file [startup-config].... (Y/N)[N] ?Y

10-Oct-2013 19:21:30 %COPY-I-FILECPY: Files Copy - source URL running-config destination URL flash://startup-config

10-Oct-2013 19:21:35 %COPY-N-TRAP: The copy operation was completed successfully

Copy succeeded

1#arp -a

% Unrecognized command

dsys-bur1#show arp

Total number of entries: 3

  VLAN    Interface     IP address        HW address          status

--------------------- --------------- ------------------- ---------------

vlan 1     gi18       192.168.1.3    xx:xx:xx:xx:xx:xx   dynamic

vlan 4     gi8        10.100.4.128   xx:xx:xx:xx:xx:xy   dynamic

vlan 4     gi3        10.100.4.253   xx:xx:xx:xx:xx:xz   dynamic

so almost fixed

Jeroen

Green

SG300-20-20 : ARP table not automatically updated

Jeroen, thanks for this update.

Okay, so delayed ARP can be a couple anomalies.

Could be port negotiation, spanning tree or something like this.

So, while the switch does not have your arp entry can you try the following test

- shut and no shut the port to see if mac recovers

- unplug then replug in the connection

- set speed to 100 full duplex with no negotiation

- disable spanning-tree on the port then disconnect / reconnect the port

If anyone of the steps work, please wr the config to memory, reboot the switch then see what happens

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
New Member

SG300-20-20 : ARP table not automatically updated

Tom,

This morning I had again the same issue. Now I've enabled ntp on the Access point so I don't have that issue any more. But if I for example shutdown my printer and start it again after then I have the same issue. The port becomes in forwarding , link is up but arp table is not updated.

The write command updates the arp table and printing starts.

I've tried the shut down/power up of the port : no luck , arp table not updated

dsys-bur1#15-Jan-2014 22:04:33 %LINK-W-Down:  gi1, aggregated (2)

15-Jan-2014 22:04:40 %LINK-I-Up:  gi1, aggregated (2)

15-Jan-2014 22:04:44 %STP-W-PORTSTATUS: gi1: STP st

unplug/replug : same result

set speed , same result

disable spanning tree , same result

Green

SG300-20-20 : ARP table not automatically updated

Hi Jeroen, is it possible for you to create a service request with the SBSC then provide it on the forum?

In the mean time, going to do some digging.

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
Green

SG300-20-20 : ARP table not automatically updated

Hi Jeroen, the only evidence I've found as a possible solution is to factory reset the switch then configure without a configuration file.

Is that something you may try?

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
New Member

SG300-20-20 : ARP table not automatically updated

Tom,

I've been testing several possibilities and found something that works for me.

The following worked for me :

     - Disabled on all ports and globally green ethernet

     - Disabled on all ports STP

Now it works like a charm. Every device is immediately recognized , mac table updated, receives IP and starts communicating.

Now I can continue to test the LAG and uplink with another switch , I shall see what that gives from additonal problems.

Regards,

Jeroen

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