are the Exchange server and the clients in the same Vlan ? I noticed that you have configured all your port channels to ´mode on´; this is not recommended: when the `on´ mode is used, it will attempt
to unconditionally channel instead of negotiating the channel. The result depends on what code is running on the switch, and what features are enabled. It is possible that BPDUs can get lost down these unidirectional paths and in turn 802.1d will unblock a link that should be blocking. This can create a loop in the network where any broadcast traffic traversing the "good" link in the etherchannel will melt the network.
If your Exchange server is located in a different Vlan, try and configure:
ip tcp adjust-mss 1350
on all Vlan interfaces in the path between the client and the server.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...