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700-0023-05-00 Rev. 1
© 2013 Cyan, Inc. – All Rights Reserved.
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Appendix A:
Best Practices for
Network Configurations
This section describes the best practices for Cyan network configurations. Recommendations include LAD
and WSS (WSS-402 or WSS-404) slot assignments, line card slot assignments, LAD and WSS link
connections, and fiber patches for LAD/WSS transport cards, and multi-port cards.
LAD and WSS Slot Assignments
Cyan recommends that LAD and WSS cards be installed from the top down in Z33 shelves and right to left
in Z77 shelves.
If a Z33 shelf is populated with only WSS cards, a WSS-402 or WSS-404 line card must be installed in slot
1 and/or 2 because WSS cards also act as controller cards. In this case, all Z33 shelves in a ring or chain
configuration that have WSS cards should have them installed in slot 1 and/or 2.
If deploying the in-chassis LAD-2P or LAD-2G module, you must install the module in slot B.
Line Card Slot Assignments
Cyan recommends that service line cards be installed from bottom to top in Z33 shelves and left to right in
Z77 shelves.
If a single PME-412, PME-216i, or 2.5G-LME4 line card is installed in an odd slot, consideration should be
given as to whether or not to populate the adjacent even slot or to leave the even slot open for future growth
and/or protection of the line card.
PME-216i line cards can be installed in either slot or both slots of the Z22 shelf.
PME-412 and PME-216i Card Pairs
A PME-412 line card must not be collocated within the same card pair slots with a PME-216i line card.
The PME-412 and PME-216i Ethernet line cards are highly interoperable, but they cannot operate with each
other in a card pair as a bridge in a Spanning Tree configuration and cannot be used in a card pair for
cross-card protection. Collocating a PME-412 and a PME-216i line card in the same card pair slots limits
your ability to configure card protection in the future without relocating one or more line cards, possibly
affecting service.