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Sunday, October 2, 2011

Flowcontrol on trunk ports

Based on port capabilities can flowcontrol can be enabled on a trunk port?

Model: WS-C3750X-48
Type: SFP-10GBase-SR
Speed: 10000
Duplex: full
Trunk encap. type: 802.1Q,ISL
Trunk mode: on,off,desirable,nonegotiate
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off,on,desired),tx-(none)

What will be the behavior when a pause frame is received? This is a dot1q trunk - will all traffic for all vlans be paused, or just particular sessions? We are concerned that one server, for example, on vlan 10 could pause traffic on another vlan by sending the port a pause frame. This is a 10Gb link to a hosting environment, that has several different SAN vlans on it.

It will pause all the traffic. Not just one session. A Iscsi san will pause to a nexus 5000 and the 5000 started dropping packet on it's uplinks. DCB can help if your san can support it. (equalogic for now) Unfortunately Flowcontrol is a no go.

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