On 07/02/2010 08:30 AM, John Wilkes wrote:
Hi.
We have a bunch of fiber taps that we want to aggregate in a Juniper
EX4200 (24 SFP) before sending it to our network analyzer.
What we thought we would do is connect all the taps to port 0 to X and
then mirror the traffic from them to port 23.
Problem: We don't get link up when we only connect to RX. It seems the
switch really really wants to talk to someone on the other end.
We have disabled autoneg, set full duplex 1G, and even turned off flow
control but the ports are still down. We have also reduced the problem
to connecting two ports directly.
When the ports are fully connected they come up. Pull just one fiber
and both ports go down.
Huh.
We do a similar thing (but not on a Juniper EX switch). It "just works".
Your direct test I would expect to fail; pulling the TX fibre will cause
the far end to signal fault and bring the entire link down.
That should not happen with the tap; the RX port should "see" link and
valid autoneg signalling (not "aimed" at it, of course!) and just come up.
Are you sure the taps are working i.e. providing a valid light-level and
so forth? What's the media & distances/powers?
What kind of tap is it? Passive fibre, OEO?
What does "show int ... extensive" show, with the tap inserted into RX?
We have tried turning off lldp, stp, rstp and mstp globally on the
switch, as well as setting half duplex.
Are any odd protocols running at the *far* end? Can you turn them off?
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