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]

On the S4 I believe only ge.2.112 and ge.3.112 are connected to the remote site via fiber. I ran the -verbose command on the S4 and got the following output:

itsd-core1-S4(su)->show neighbors -verbose ge.2.112Port ge.2.112
Neighbor : 20-b3-99-3d-a9-8e
System Name : 180-OLD-COLONY
Description : SecureStack B5
Location : 180 OCC 2nd FL Closet
MTU : 0
Last Update : THU JAN 01 00:00:00 1970
LLDP
Chassis Id : 20-b3-99-3d-a9-8e
Port : ge.1.46
Support :
Enabled :
CiscoDP
Device Id : 20b3993da98e
Address : 10.99.180.5
Port : ge.1.46
Version : 2
Primary Management : 10.99.180.5
Duplex : Full Duplex
Power : 0 milliwatts
Support : 0x0b01
Neighbor : 20-b3-99-3d-ae-c2
System Name : 162-OLD-COLONY-1
Description : SecureStack B5
Location : 162-OLD-COLONY
MTU : 0
Last Update : THU JAN 01 00:00:00 1970
LLDP
Chassis Id : 20-b3-99-3d-ae-c2

Port : ge.1.48
Support :
Enabled :
CiscoDP
Device Id : 20b3993daec2
Address : 10.99.162.12
Port : ge.1.48
Version : 2
Primary Management : 10.99.162.12
Duplex : Full Duplex
Power : 0 milliwatts
Support : 0x0b01
Neighbor : 00-01-f4-61-34-00
System Name : 162-OLD-COLONY-1
Description : Matrix 1H582-51 : 03.07.30
Port : Gigabit Ethernet Frontpanel port 81
Last Update : THU JAN 01 00:00:00 1970
CDP
Neighbor IP : 10.99.180.1
Chassis IP : 10.99.180.1
Chassis MAC : 00-01-f4-61-34-00
Device Type : router
Support : igmp, rip, ospf, dvmrp, ieee8021q, gvrp

itsd-core1-S4(su)->show neighbors -verbose ge.3.112
Port ge.3.112
Neighbor : 20-b3-99-3d-a9-8e
System Name : 180-OLD-COLONY
Description : Enterasys Networks, Inc. B5 -- Model B5G124-48P2 Rev
06.81.04.0001
Location : 180 OCC 2nd FL Closet
Port : ge.1.47
MTU : 0
Last Update : THU JAN 01 00:00:00 1970
LLDP
Chassis Id : 20-b3-99-3d-a9-8e
Port : ge.1.47
Support :
Enabled :
CDP
Neighbor IP : 10.99.180.5
Chassis IP : 10.99.180.5
Chassis MAC : 20-b3-99-3d-a9-8e
Device Type : dot1qSwitch
Support : ieee8021q, gvrp, igmpSnoop
CiscoDP
Device Id : 20b3993da98e
Address : 10.99.180.5
Port : ge.1.47
Version : 2
Primary Management : 10.99.180.5
Duplex : Full Duplex
Power : 0 milliwatts
Support : 0x0b01

[Erik_Auerswald]

Do you know what device sends a port name of "Gigabit Ethernet Frontpanel port 89" resp. "Gigabit Ethernet Frontpanel port 73"? Ip address 10.99.180.3 resp. 10.99.180.1? Does "show neighbors -verbose PORTSTRING" on the S4 provide useful information?

[Stephen_McGuire]

The links are fiber links, can there be a hub on that port? I don't think so, will have to head to the site and trace cables.

[Stephen_McGuire]

20:B3:99:3D:AE:C2 search in Netsight shows it as the Netmgmt port for another switch in that remote campus location. This is quite confusing.

Here's the show nei on that switch:
162-OLD-COLONY-1(su)->show nei Port Device ID Port ID Type Network Address
---------------------------------------------------------------------------------
ge.1.33 04:A1:51:A8:A9:6C g1 lldp 10.128.175.160
ge.1.48 20b3993da98e ge.1.46 ciscodp 10.99.180.5
ge.1.48 00-1f-45-fb-7d-48 ge.2.112 ciscodp 10.99.0.1
ge.1.48 00:00:00:00:00:00 Gigabit Ethernet Frontpanel port 89 cdp 10.99.180.3
ge.1.48 20:B3:99:3D:A9:8E ge.1.46 lldp
ge.1.48 00:1F:45:FB:7D:48 ge.2.112 lldp

[Daniel_Coughlin]

Yes this should be investigated:
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

Which connection should 20:B3:99:3D:AE:C2 be on. It is possible that this is stale information or it is real and someone moved a cable. You need to get to the bottom of this.