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got it fixed..just a bad cable...
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I'm at a site where there are citrix servers in a LAN connected to a switch stack (4 switches) ... there are lots of packets drops within the LAN, lot of retransmissions to/from the citrix server to any host in the LAN .. I'm looking at the possible reasons for this packet loss in LAN ... ? any pointers to look at ... 
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I'm at a site where there are citrix servers in a LAN connected to a switch stack (4 switches) ... there are lots of packets drops within the LAN, lot of retransmissions to/from the citrix server to any host in the LAN .. I'm looking at the possible reasons for this packet loss in LAN ... ? any pointers to look at ... 

citrix server packet loss

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Transmission Control Protocol/Internet Protocol (TCP/IP) is the set of networking protocols that define end-to-end connectivity specifying how data should be packeted, addressed, transmitted, routed and received at the destination. This functionality is organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.

TCP/IP

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.