08-29-2016 11:37 PM - edited 07-05-2021 05:45 AM
Hi,
CVD reg. LAN and WLAN of August 2016 (www.cisco.com/c/dam/en/us/td/docs/solutions/CVD/Aug2016/Campus_LAN_Wireless_LAN_Design_Aug2016.pdf) is recommending the following design (page 31 and 32):
"Spreading the ports from the active and standby WLCs across both switches within the VSS pair. This design minimizes the traffic that crosses the virtual switch link between the Catalyst switches in the VSS pair during normal (non-failure) operation, because both the active and standby WLCs have ports connected to both switches. This design also avoids a switchover from the active WLC to the standby WLC in the event of a switch failure within the VSS pair".
We tried it that way but without success.
Due to that, we went back to use different port-channels between VSS and WLC's:
- Po1 = WLC-primary (Gi 1/1/1, Gi 1/2/1, Gi 2/1/1, Gi 2/2/1)
- Po2 = WLC-secondary (Gi 1/1/2, Gi 1/2/2, Gi 2/1/2, Gi 2/2/2)
The software version of WLC 5508 is 8.0.121.0, VSS is build on Cat 4510R+E running IOS 03.08.02.E.
Did anybody test the recommended design and did it work that way?
Thanks in advance and best regards
Matthias
08-29-2016 11:50 PM
Hi,
Yes. LAG with VSS setup, will work as long as the fragments of an IP packet are sent to the same port. The idea is that if you go to multiple switches, the ports must belong to the same L2 “entity” with regards to load balancing decisions.
MOre info: https://supportforums.cisco.com/document/69961/wlc-lag-catalyst-6500-switches
http://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-1/5520-WLC-DG/b_Cisco-5520-WLC-deployment-guide.html
Reagrds
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08-29-2016 11:56 PM
Hi Sandeep,
the VSS/Cat4500 is configured for "src-dst-ip" already. But it didn't work.
Any idea?
Best regards
Matthias
08-30-2016 12:29 AM
08-30-2016 03:48 AM
What part and format reg. config are you looking for (screenshots, GUI or text, interfaces, ...)?
08-30-2016 04:35 AM
config on VSS switches (interfaces)
08-30-2016 04:46 AM
Hi,
we're running Po12 with 4 ports to connect WLC-01 and Po13 with 4 ports to connect WLC-02.
The config is:
interface Port-channel12
description Uplink WLC-01 - Gi1/1/11_1/2/11_2/1/11_2/2/11
switchport
switchport trunk allowed vlan 10,38-40,48,500
switchport mode trunk
!
interface Port-channel13
description Uplink WLC-02 - Gi1/1/12_1/2/12_2/1/12_2/2/12
switchport
switchport trunk allowed vlan 10,38-40,48,500
switchport mode trunk
!
interface GigabitEthernet1/1/11
description WLC-01 Port1
switchport trunk allowed vlan 10,38-40,48,500
switchport mode trunk
channel-group 12 mode on
interface GigabitEthernet1/1/12
description WLC-02 Port1
switchport trunk allowed vlan 10,38-40,48,500
switchport mode trunk
shutdown
channel-group 13 mode on
Please note: We tried to run all 8 ports within Po12 - but it didn't work that way.
08-30-2016 04:53 AM
Yes that right.. you need to use diff port channel for diff WLCs.
Example, port-Channel 12 for WLC1 and PO13 for WLC2
Config is correct and it must work.
*** You can not use same Port channel fro both WLCs.
Regards
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08-30-2016 04:57 AM
Thx - that's what we tested already
So the question is: Why does the CVD tell a different story?
"EtherChannel Port Group Consisting of Eight Ports on Multiple Linecards Across a Catalyst VSS Pair"
"Spreading the ports from the active and standby WLCs across both switches within the VSS pair. This design minimizes the traffic that crosses the virtual switch link between the Catalyst switches in the VSS pair during normal (non-failure) operation, because both the active and standby WLCs have ports connected to both switches. This design also avoids a switchover from the active WLC to the standby WLC in the event of a switch failure within the VSS pair".
08-30-2016 05:07 AM
Must need to check...
As per my experience... The right solution is two etherchannels.
Regards
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09-05-2016 11:31 AM
The picture within the CVD is wrong, you did the right thing. Both WLCs should have their own port-channel because they function in an active/standby setup and you don't want the standby unit to receive the production traffic.
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