Depending on how you use the IDSM, inline or promiscuous, I would suggest looking into the Multi Chassi Ethernet option available with VSS. If both IDSM join the port channel and share the traffic that would in effect make then a failover pair.
Here's the link to the IPS 7.x CLI mnaual regarding setting up and sharing an etherchannel across two IPSmodules. Just top of my head I would use inlineVLAN pair, that way I would save one interface for the future. I would then have my incoming data ports connect to one VLAN (Side A) and the outgoing data on the other VLAN (Side B).
Thank you for link. But AFAIK there is no ESLB support for IDSM in different chassis. Link that you sent me is for load balancing in the same chassis. Do you mean that I need similar EtherChannel and inline VLAN pair mode configurations on both IDSM and then I need to connect both IDSM by multichassis ethernet?
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...