Lag configuration question

[Stephen_McGuire]

I have an S4 (main campus) with a lag on one end and I have three stacked B5's (remote campus) on the other. They are connected via 1 mile long fiber.

Complaint from end user's has been poor internet speeds at the remote campus. They are on a VLAN and come back via the fiber to go out through our internet provider.

I just started this job and am new to the extreme EOS though I just finished the bootcamp and passed the switching and routing exam.

I started to just look at the VLAN performance and noted it was terrible and I'm on main campus side. I'm trying to document the existing switching design etc. So I began to dig into how things are connected L1/L2.

I did notice though that I have two ports on the S4 setup as a LAG to the stacked B5's but on the stacked B5's there are NO LAGs configured. Globally LACP is enabled on both ends but the stack hasn't been configured with a lag.

So first question is, how does this even work? I thought that you had to have both ends configured properly for the LAG to work. I know they can form automatically due to the global setting but I can't find anything on the B5's to indicate that has occurred.

Should I go ahead and setup the lag properly on each end with aadminkey's which one side appears to have already?

Port status shows the ports on the remote end to both be UP, all of the lag's appear as down this is the same as the main campus.

So it looks to me that the lag's are not configured and up properly and that neither end is setup.

Sorry for the long story but wanted to get some feed back on the situation. 🙂

Thoughts and suggestions are appreciated!
-Stephen

[Stephen_McGuire]

Hello, I'll do my best to answer the questions:
B5, show lacp lag.0.* show no lags with ports setup.

I don't believe I have single port lag enabled.

When I run show neighbors on the B5 I get the following output that is confusing:
180 OCC(su)->show nei
Port Device ID Port ID Type Network Address
---------------------------------------------------------------------------------
ge.1.46 20b3993daec2 ge.1.48 ciscodp 10.99.162.12
ge.1.46 00-1f-45-fb-7d-48 ge.2.112 ciscodp 10.99.0.1
ge.1.46 00:00:00:00:00:00 Gigabit Ethernet Frontpanel port 73 cdp 10.99.180.1
ge.1.46 20:B3:99:3D:AE:C2 ge.1.48 lldp
ge.1.46 00:1F:45:FB:7D:48 ge.2.112 lldp
ge.1.47 00-1f-45-fb-7d-48 ge.3.112 ciscodp 10.99.0.1
ge.1.47 00:1f:45:fb:7d:48 ge.3.112 cdp 10.99.0.1
ge.1.47 00:1F:45:FB:7D:48 ge.3.112 lldp

It looks as if there are more than one devices connected via ge.1.46?

Port counters shows no errors on the B5 or the S4.

Vlan show run from S4:
configure terminal
!
interface vlan.0.91
description "180-OCC"
ip address 10.128.191.1 255.255.255.0 primary
ip helper-address 10.150.0.30
ip helper-address 10.150.0.70
no ip proxy-arp
no ip redirects
no shutdown
exit

[Daniel_Coughlin]

Stephen,

I would suggest configuring the SecureStack side correctly. Then use the show lacp commands to make sure it is the way you want it. This article should guide you:How to Configure Dynamic LAGs with LACP on Securestack or Chassis based switches . If you run into problems let us know.

[Stephen_McGuire]

Thanks, I had most of the CLI already but that's a great link.