at&t decaman

just curious if anyone ha used this service or another provider's 10g service to connect 2 datacenters together?   we have 2 nexuses at each datacenter but the 10 g link is not coming up.   5548 at one colo and 9396 at the other.    ATT has a ciena 6500 switch at both locations with a sonet oc192 sr 1 sfp in it.  we're using cisco sfp 10gb-lr in both of our nexuses.   if anyone has any experience or input I would be very appreciative.   I've tried hard-coding the speed, duplex, no negotiate auto, reversing the polarity on the fiber.......to no avail.   Thanks so much
techlindenAsked:
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David Johnson, CD, MVPOwnerCommented:
9.510 Gbit/s is the maximum you will get once you strip off the overhead so 9.396 isn't bad but the 5.3xxx is something that needs investigating.
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giltjrCommented:
@David Johnson, CD (IT-Expert-Pro MVP) --  5548 and 9396 are Cisco Nexus model numbers not link speeds.

@techlinden  Never used those services nor 10 Gbps link, but are you seeing any errors in either of your switch's logs?

Does AT&T see any errors on their switches?
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Nathan HawkinsTechnical Lead - Network SecurityCommented:
Typically an interface has to be configured with specific settings to compliment (and work with) whats on the other side of the connection. Just plugging in the cable is not going to bring the connection up. Please give specifics to the interface on both sides as well as a show interface detail of those same interfaces.
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techlindenAuthor Commented:
we figured it out.    polarity had to match (rx t tx) at both ends ...ie. datacenters.

if you do show int eth1/10 transceiver details and notice an rx -26 or something weird you probably have the polarity reversed.     should be between -1 and -6.   we found a helpful att engineer who pointed us in the right direction.
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