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can you provide the relevant switch and/or router config.
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can you provide the relevant switch and/or router config.

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perhaps on the uplink port between the C3750 and C6509 do this:<br />
<br />
spanning portfast trunk
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perhaps on the uplink port between the C3750 and C6509 do this:

spanning portfast trunk

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The uplinks ports do not have spanning tree portfast truck configured, could the problem be a very active spanning tree, i have'nt checked but are these symptonys of an active span tree. 
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The uplinks ports do not have spanning tree portfast truck configured, could the problem be a very active spanning tree, i have'nt checked but are these symptonys of an active span tree.

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I'm not sure that is causing it. &nbsp; Problem is there's a lot of moving parts invovled in this. &nbsp;What type of firewall are you using? &nbsp;and how does your topology look like?
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I'm not sure that is causing it.   Problem is there's a lot of moving parts invovled in this.  What type of firewall are you using?  and how does your topology look like?

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I'm experiencing intermittent connectivity to devices connected to a 3750 switches when users over a WAN are polling particular devices. The switches are connected to two core 6509s.<br />
The interfaces are not flapping and nothing in the logs. Spanning tree port fast configured on all interfaces.<br />
<br />

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I'm experiencing intermittent connectivity to devices connected to a 3750 switches when users over a WAN are polling particular devices. The switches are connected to two core 6509s.
The interfaces are not flapping and nothing in the logs. Spanning tree port fast configured on all interfaces.



Intermittent connection issues...Cisco 3750 - devices

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Broadband

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

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.