Ethernet Circuit/XCVT Limitations?

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May 22nd, 2008
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We are running a 20 node, ONS-15454 SONET ring, OC-48, with XCVT and the E100T-12-G Ethernet cards in each node.

One node currently has 3) STS-1 Ethernet circuits provisioned to it and we wanted to add 4)new STS-3c circuits. The first two were created with no problem but when the 3rd was being created, the option to select the Ethernet card slot was no longer available, only the OC-48 cards. We are able to create 3 new STS-1 circuits, with no problems, but no STS-3c.

Are we simply maxing out our cross-connect/XCVT? Is there some limitation on the E100T-12-G cards? Will upgrading to the XC10G remedy the problem?

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tphelps Thu, 05/22/2008 - 13:22
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1. What software release are you running?


2. Is the card in EtherSwitch mode or Stitched/Group mode?


3. Is there SPR?


4. Are you in port mapped mode?


You typically get up to STS-12c of bandwidth to an E-series card. 3x STS-1 and 4x STS-3c is more than STS-12c. Also, creating the larger circuits (STS-3c) first then smaller (STS-1) circuits may be required.


I doubt the XC is maxed out if the only ring is OC-48.

Tom Randstrom Thu, 05/22/2008 - 15:08
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As a follow-on to "tphelps" comments, the E-Series card's bandwidth is limited to a maximum of STS-12 to the backplane. As was earlier stated, restrictions required circuits to be created in a specific order, per the notice url provided below (I would assume the restrictions are still valid in newer SW).


http://www.cisco.com/en/US/ts/fn/100/fn12917.html


Depending on the type of Ethernet circuits you are trying to carry across the optical network (pt-to-pt, shared packet ring), you may want to consider using the newer CE-series, G-Series or ML-series Ethernet cards. The E-Series cards are of an old design and have been EoL'd.


Hope this helps.


Tom Randstrom Tue, 06/17/2008 - 18:07
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Correct. The STS-1s need to be contiguous for an STS-3c circuit. If only the card supported virtual concatenation (which it does not), then any 3 STS-1s could be used to create a virtual STS-3c.

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