What would be the best solution to update the IOS on the whole cluster without a downtime?
Not possible. Here's the logic:
Let's say you are able to successfully push the firmware to the two units. If you reload only one of them, the one being reloaded will NOT be able to join the HA SSO pairing because of firmware incompatibility. \
I just finished an upgrade of three pairs of WiSM-2 HA AP SSO. What I've done is push the firmware across, force the APs to pre-download the firmware and then reboot the pair of WiSMs. The reboot is scheduled for 4 am.
Another alteration is this:
Let's say you have TWO pairs of WiSM-2 and both pairs are in AP SSO.
So you push the firmware to the two pairs. Next, you force the AP in one pair to go to the second pair. Reboot the first pair. For APs in the second pair, trigger the AP pre-download. Once the first pair of WLC come back online, move all the APs in the second pair to go to the first WLC. Once the APs have rebooted and joined the first WLC, reboot the second pair of WLC.
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(#)For this reason being that : - application that doesn't use multicast, sends one copy of each packet ( data unit of traffic at layer 3 ) to each client (" who seeks the traffic ).- application that does use multicast, sends ...
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
This is the start of a display filter cross reference between Wireshark and OmniPeek.
The 1st installment is a table of advanced filters. More filters will be added as time allows.
It is a living doc, so check back for changes every so often
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