Cisco Wireless Lan Controller PortChannel

[Christian Maus]

Hi all,

i'm trying to setup a ether-channel on WLC Controller 5008.

Till now, the Channel was not showing as connected (even after reboot).

Any idea about the issue?

Neighbor Switch:

Gi1/21    po3-wlan-ctrl  notconnect   1            full   1000 1000BaseSX

Gi1/22    po3-wlan-ctrl  notconnect   1            full   1000 1000BaseSX
Gi1/23    po3-wlan-ctrl  notconnect   1            full   1000 1000BaseSX
Gi1/24    po3-wlan-ctrl  notconnect   1            full   1000 1000BaseSX

interface GigabitEthernet1/21
 description po3-wlan-ctrl
 switchport trunk allowed vlan 6-8
 switchport mode trunk
 logging event link-status
 logging event trunk-status
 channel-group 3 mode on
!
interface GigabitEthernet1/22
 description po3-wlan-ctrl
 switchport trunk allowed vlan 6-8
 switchport mode trunk
 logging event link-status
 logging event trunk-status
 channel-group 3 mode on
!
interface GigabitEthernet1/23
 description po3-wlan-ctrl
 switchport trunk allowed vlan 6-8
 switchport mode trunk
 logging event link-status
 logging event trunk-status
 channel-group 3 mode on
!
interface GigabitEthernet1/24
 description po3-wlan-ctrl
 switchport trunk allowed vlan 6-8
 switchport mode trunk
 logging event link-status
 logging event trunk-status
 channel-group 3 mode on

(Wireless Lan Controller): LAG Mode on Next Reboot: Enabled

lan-core#show version
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-IPBASEK9-M), Version 15.0(2)SG8, RELEASE SOFTWARE (fc2)

[Ric Beeching]

Have you enabled all the interfaces on the WLC? 

config port adminmode all enable

If so and still not working please post a show port summary

Thanks,

Ric

[Christian Maus]

Hi Ric,

config port adminmode all enable -> done

(Cisco Controller) >show port summary

           STP   Admin   Physical   Physical   Link   Link
Pr  Type   Stat   Mode     Mode      Status   Status  Trap     POE    SFPType
-- ------- ---- ------- ---------- ---------- ------ ------- ------- ----------
1  Normal  Forw Enable  Auto       1000 Full  Up     Enable  N/A     1000BaseTX
2  Normal  Disa Enable  Auto       Auto       Down   Enable  N/A     Not Present
3  Normal  Disa Enable  Auto       Auto       Down   Enable  N/A     Not Present
4  Normal  Disa Enable  Auto       Auto       Down   Enable  N/A     Not Present
5  Normal  Disa Enable  Auto       Auto       Down   Enable  N/A     1000BaseSX
6  Normal  Disa Enable  Auto       Auto       Down   Enable  N/A     1000BaseSX
7  Normal  Disa Enable  Auto       Auto       Down   Enable  N/A     1000BaseSX
8  Normal  Disa Enable  Auto       Auto       Down   Enable  N/A     1000BaseSX

[Ric.Beeching.Education]

Ok so the WLC can't even see an SFP in its physical slot. Is there definitely an appropriate SFP installed (GLC-T) with the UTP cable plugged in going to the 4500 switch?

Also I assume you have restarted the WLC at some point once you enabled LAG?

Thanks,

Ric

[Christian Maus]

Hi Ric,

WLC was rebooted after LAG enabled.

I use 1000 BaseSX SFP with 50/125 fiber cable , i assume that it is not only working with GLC-T with UTP or am i wrong?

[Ric Beeching]

Just re-read up top and realised it could see the SFPs.. just in the last slots.. duh Ric.

So from a physical point of view you're plugging OM3 LC Fibre in on the last 3 ports but using copper on your first port.. bit odd but it will work if they are all the same speed (1 Gig).

Can you paste a show interface GigabitEthernet1/23 and show etherchannel 3 summary and show etherchannel 3 detail.

I take it you can't test a second link with GLC-T transceivers temporarily to see if it comes up?

Ric

[Christian Maus]

Hi Ric,

yes first port will be replaced through the last 4 ports with OM3 LC

Havent tested yet with GLC-T transceivers as i dont have one on short notice...but yes i could test that as well.

Outputs:

lan-core-#show interfaces gigabitEthernet 1/23
GigabitEthernet1/23 is down, line protocol is down (notconnect)
  Hardware is Gigabit Ethernet Port, address is 30e4.dbfd.1b0a (bia 30e4.dbfd.1b0a)
  Description: po3-wlan-ctrl
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, Auto-speed, link type is auto, media type is 1000BaseSX
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 8 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

interface GigabitEthernet1/23
 description po3-wlan-ctrl
 switchport trunk allowed vlan 6-8
 switchport mode trunk
 logging event link-status
 logging event trunk-status
 channel-group 3 mode on

lan-core-#show etherchannel 3 summary
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

Number of channel-groups in use: 2
Number of aggregators:           2

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
3      Po3(SD)          -        Gi1/21(D)   Gi1/22(D)   Gi1/23(D)
                                 Gi1/24(D)

lan-core#show etherchannel 3 detail
Group state = L2
Ports: 4   Maxports = 8
Port-channels: 1 Max Port-channels = 1
Protocol:    -
Minimum Links: 0

                Ports in the group:
                -------------------
Port: Gi1/21
------------

Port state    = Down Not-in-Bndl
Channel group = 3           Mode = On              Gcchange = -
Port-channel  = null        GC   =   -             Pseudo port-channel = Po3
Port index    = 0           Load = 0x00            Protocol =    -

Age of the port in the current state: 62d:06h:17m:10s

Port: Gi1/22
------------

Port state    = Down Not-in-Bndl
Channel group = 3           Mode = On              Gcchange = -
Port-channel  = null        GC   =   -             Pseudo port-channel = Po3
Port index    = 0           Load = 0x00            Protocol =    -

Age of the port in the current state: 62d:06h:17m:10s

Port: Gi1/23
------------

Port state    = Down Not-in-Bndl
Channel group = 3           Mode = On              Gcchange = -
Port-channel  = null        GC   =   -             Pseudo port-channel = Po3
Port index    = 0           Load = 0x00            Protocol =    -

Age of the port in the current state: 62d:06h:17m:14s

Port: Gi1/24
------------

Port state    = Down Not-in-Bndl
Channel group = 3           Mode = On              Gcchange = -
Port-channel  = null        GC   =   -             Pseudo port-channel = Po3
Port index    = 0           Load = 0x00            Protocol =    -

Age of the port in the current state: 62d:06h:17m:14s

                Port-channels in the group:
                ---------------------------

Port-channel: Po3
------------

Age of the Port-channel   = 21d:02h:51m:18s
Logical slot/port   = 11/3          Number of ports = 0
GC                  = 0x00000000
Port state          = Port-channel Ag-Not-Inuse
Protocol            =    -
Port security       = Disabled

[pwwiddicombe · Accepted solution]

1.  Is there any messages of any type in the switch the port channel terminates on, particularly if you disconnect and reconnect the 4 fiber links? 

2.  When the 4 fiber links are attached, could you do a "sh cdp neigh" to verify you actually have physical connectivity on the 4 ports?

3.  Do you see link lights on switch or controller that indicate the physical link is active?

Even if there is a mismatch on the LAG link somehow, I would think you should see a link light on the interfaces, but from the displays above it almost looks like interfaces are down.

[Ric Beeching]

Yes it definitely seems like some sort of mismatch of SFPs/Configs causing the link to not even come up.

Can you describe what the setup is on the wired side? Is it a dedicated line card hosting 1Gig links like the ethernet link that is already established?

Ric

[Christian Maus]

Hi Ric,

the issue was very stupid one. Even though i changed both cable directions, there was an issue with the cable catch at the end of the cable. There was a minimal gap to the SFP input, so everything was configured properly, but the port channel didnt came up.

So everything is working now.... thx!

[Freerk Terpstra]

Did you already flip the individual RX/TX fibers on one side of the connection? The two fibers within the patchcord should be connected in a way that RX on one side is connected with TX on the other side.

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