[rbak-nsp] SE400 link aggregation problem with load balancing

Thu Jan 21 03:50:57 EST 2010

Problem is that I have already have 6 L3 links in OSPF with balancing on that level. Since this device is connected to Cisco device, 
OSPF on Cisco device is not using more than 6 links, so I could not put more links for uplink expansion...
That is why I tried to get this link group on L2 to work, so I can have more than 6 physical links for traffic, because 6 links is not enough (and hope that new devices are comming soon)...

Best Regards.
Elma

Date: Thu, 21 Jan 2010 09:36:26 +0100
Subject: Re: [rbak-nsp] SE400 link aggregation problem with load balancing
From: frans at falco-networks.com
To: elmicak at hotmail.com; ripleydotnet at gmail.com
CC: tanan.satayapiwat at ericsson.com; redback-nsp at puck.nether.net

Re: [rbak-nsp] SE400 link aggregation problem with load balancing

Elma,

As you tried to get this working over an aggregated Ethernet link, would it help to configure separated /30’s over each link and use ECMP to balance the load across this trunk?

You need to have equal routes over each link, ospf can help you to accomplish that, or a few statics will do as-well. 

It seemed that link aggregation is stuck somewhere in your system. 

Kind regards,

Frans.

From: "Elma K." <elmicak at hotmail.com>

Date: Thu, 21 Jan 2010 06:37:50 +0000

To: <ripleydotnet at gmail.com>

Cc: <tanan.satayapiwat at ericsson.com>, Frans Legdeur <frans at falco-networks.com>, <redback-nsp at puck.nether.net>

Subject: RE: [rbak-nsp] SE400 link aggregation problem with load balancing

Unfortunately, there are no commands for lacp protocol under link group... Possible because old SEOS version.

Subject: Re: [rbak-nsp] SE400 link aggregation problem with load balancing

From: ripleydotnet at gmail.com

Date: Wed, 20 Jan 2010 12:12:44 -0700

CC: tanan.satayapiwat at ericsson.com; frans at falco-networks.com; redback-nsp at puck.nether.net

To: elmicak at hotmail.com

make sure you enable lacp active in the link-group.

On 2010-01-20, at 8:53 AM, Elma K. wrote:

Source IPs on SE400 side are from the pool configured on that device, and destination IPs are various (Internet traffic for our pppoe subscribers)...

Link IPs should not have meaning in this case, because link is just for transit traffic. Also, source and destination IPs should be different, because

it is the most unlikely that this traffic is from just one subscriber sending to just one IP...

From: tanan.satayapiwat at ericsson.com

To: elmicak at hotmail.com; frans at falco-networks.com; redback-nsp at puck.nether.net

Date: Wed, 20 Jan 2010 10:13:52 -0500

Subject: RE: [rbak-nsp] SE400 link aggregation problem with load balancing

Frans mean the source and destination IP of the packets traveling through the link. It does not have to be IP address of the link itself since the traffic can be transit traffic.

Tanan

From: redback-nsp-bounces at puck.nether.net [mailto:redback-nsp-bounces at puck.nether.net] On Behalf Of Elma K.

Sent: Wednesday, January 20, 2010 4:10 PM

To: frans at falco-networks.com; redback-nsp at puck.nether.net

Subject: Re: [rbak-nsp] SE400 link aggregation problem with load balancing

The link is with /30 mask, so I can not take just 1 higher IP... Maybe I can change both IPs on this link, 

but I have to check this with a coleague that works on the other device, to see if this is possible for him.

I will let You know when I get this info. In the meantime, if there is any other idea, I would appreciate it.

Regards

Elma

Date: Wed, 20 Jan 2010 16:03:25 +0100

Subject: Re: [rbak-nsp] SE400 link aggregation problem with load balancing

From: frans at falco-networks.com

To: elmicak at hotmail.com; redback-nsp at puck.nether.net

Hi Elma,

Do you by any change use the same IP address as destination and/or source?

The way the balancing works is based on something like source IP plus destination IP plus destination port, that will stick to the same physical link.

I ran into this problem once, solved the test by adding another source 1 IP address higher and that took another link. 

I don’t know if you have the same kind of trouble there.

Kind regards,

Frans.

From: "Elma K." <elmicak at hotmail.com <http://hotmail.com> >

Date: Wed, 20 Jan 2010 14:57:15 +0000

To: <redback-nsp at puck.nether.net <http://puck.nether.net> >

Subject: [rbak-nsp] SE400 link aggregation problem with load balancing

Hello.

I have SE400 connected to other device, and I have configured link aggregation on SE400, 

everything works fine except load-balancing from Redback's side... 

Traffic that is going from redback is not balanced on link group members, it is gong only on one port.

I guess there must be some configuration to change the way the device is doing this load balancing

between group members.

My device is with SEOS-2.6.7 (no chance for upgrade, unfortunately)

and the config is like this:

link-group hsiUplink-2PCh ether

 bind interface uplink-2 hsi

port ethernet 1/5

 link-group hsiUplink-2PCh

!

port ethernet 1/7

 link-group hsiUplink-2Ch

!

port ethernet 3/12

 link-group hsiUplink-2PCh

!

Could anyone help me, please?

Best Regards.

Elma

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