Q1: It is reasonable to use prioritization as closer to the smallest link as possible. In you case I gues that is on Mikrotik router. There is no sense to prioritize it on 3560 if it has big pipe to squid and then start loosing those packets on mikrotik on slower WAN connection. So first of all locate where oversubscription may start - consider all hosts sending at maximum rate (100MB or 1Gig??) at a time - will it cause oversubscription of link 356-squid? If yes consider QoS there for skype. If not go to next step. I guess the smallest pipe is mikrotik-WAN so that is a place for prioritization.
Q2: Well, non-trivial question -Skype made its protocol hard to catch not to have it easy blocked by ISP's. They use multiple destination ports I guess both TCP for connection and UDP for traffic and also multiple destination ip addresses. You will need to get some statistics on what are the ones used in your network collecting some traffic and then examining it and then build rules upon it.
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...