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Author Topic: 1624G Arp Errors  (Read 3676 times)

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Offline mjackson

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1624G Arp Errors
« on: May 06, 2013, 02:18:54 PM »
I have noticed during peak times clients will take a while to gain internet connection and their MAC and IP address will not show up in the ARP table of the 1624G.  Clients get an IP address from DHCP just fine but takes a while to get internet connection.  I pulled the tech support log up on the 1624G and this is what I found:

CPU1 [04/25/13 10:40:50] HAL WARNING NPAL_AddArp: No more hardware space  available in system for the arp
 [04/26/13 16:31:29] The previous message repeated 404382 time(s).

Does anyone know what this means and could this be the issue we are experiencing?


Offline Dominik

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Re: 1624G Arp Errors
« Reply #1 on: May 06, 2013, 02:45:05 PM »
Looks like your ERS1624 has reached the maximum ARP entrys that it can handle.
Regarding to the 2.1 Release notes the ERS1624 is capable of 1372 ARP entrys:
http://downloads.avaya.com/css/P8/documents/100096583

How many ARP entrys do you have on peak times on your device ?
How is the ARP timer configured in seconds ?
Itīs always the networks fault!
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Offline mjackson

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Re: 1624G Arp Errors
« Reply #2 on: May 06, 2013, 02:57:34 PM »
We have about 1650 ARP entries during peak times.

ARPLifeTime is set to 5 minutes.

With this many ARP entries would you suggest upgrading to other switch?  We are a University and we expect more students in the fall and with BYOD we could be facing this issue for a while if we don't come up with a solution. 

Offline Telair

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Re: 1624G Arp Errors
« Reply #3 on: May 06, 2013, 05:22:29 PM »
Avaya Ethernet Routing Switch 5600 class switches as of v6.3.0 software can handle 2500 ARP entries.  Is that enough for you?

Offline Dominik

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Re: 1624G Arp Errors
« Reply #4 on: May 07, 2013, 09:20:00 AM »
The ERS1600 was designed for Networks with up to ~1000 Clients.
In your case you have reached the hardware limit of your ERS1624, so I would recommand to
upgrade the core.
For a quick workaround that I only would do temporarly until you can upgrade the core you can
devide your L3 routing to different devices.
You can use an ERS5000 or your SSG550 for L3 in some VLANs/Subnets, e.g. you have 10 VLANs/Subnets
on your ERS1624, you delete 5 of the L3 Interfaces and configure these 5 Interfaces to a ERS5000 or your SSG550. That would reduce the ARP packets that have to handeled on the ERS1624 by 50%.
It is not an optimal network design, but it would give you a quick workaround.
In the long term I would upgrade the core to device that can handle all the expected Clients on your Network. As mentioned by Telair the ERS5600 can handle with SW 6.3 2500 ARP entries. I would take a look at the ERS5632 wich is agood choice as a core switch.
If 2500 ARP entrys isnīt enough take a look at the VSP7000, it can handle 4000 ARP entrys.

Cheers
Itīs always the networks fault!
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Offline mjackson

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Re: 1624G Arp Errors
« Reply #5 on: May 07, 2013, 10:23:13 AM »
Thanks Dominik and Telair.  We are looking at replacing the core this summer.  The last day of classes is coming up this week so our load will drop and free up some ARP space.