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What are limitations for using long-distance ISL?

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TitleWhat are limitations for using long-distance ISL?
Question
What are limitations for using long-distance ISL?
Environment
  • VDX
  • NOS
Answer
Metro VCS supports long-distance ISL ports up to 30 km on the Brocade VDX platforms listed in the following table. Links up to 10 km are lossless.

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Guidelines and restrictions for long-distance Metro VCS

Consider the following guidelines and restrictions when configuring long-distance Metro VCS:
  • Long-distance-ISLs are only supported on 10G interface links.
  • Only one long-distance-ISL is supported within a single port group.
  • Long-distance-ISL is not supported on 10G copper RJ-45 interfaces
  • Long-distance-ISL is not supported on 40G-to-10G breakout interfaces
  • Brocade trunking is not supported with long-distance ISLs, but up to eight 8-link ECMP trunks can be used.
  • Edge ports within the same port group where a long-distance ISL is configured cannot be configured with DCB maps.
  • Edge ports within the same port group where a long-distance ISL is configured cannot be configured by means of the fcoeport default command.
  • A maximum of three PFCs can be supported on a Metro VCS configured platform. By default, PFC is enabled by class 3 and 7.
  • The Brocade VDX 6740 switches support only two PFCs.
  • All the ports in the port group are rebooted when a port is configured for long distance.
  • For 2-, 5-, 10-km long distance, use Brocade-supported long-range (LR) optics for direct connectivity.
  • For 30-km long distance, use Brocade-supported extended-range (ER) optics for direct connectivity.
  • A port group containing a long-distance port cannot have a CEE map configuration on any edge port.
  • For 2-km and 5-km long-distance ISLs, one additional standard ISL connection is supported on the same long-distance port group.
  • Lossless FCoE traffic is supported up to 10 km with long-distance ISL configured.
  • Lossy Layer 2/Layer 3 traffic is supported up to 30 km with long-distance ISL configured
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Additional notes
You might see following error in Raslog:
[QOSD-1006], 162311, SW/0 | Active, ERROR, sw0, Interface TenGigabitEthernet X/X/X is not allowed to come up as ISL because of Long Distance ISL restriction. Shutting down interface

Note: For 2-km and 5-km long-distance ISLs, one additional standard ISL connection is supported on the same long-distance port group. Even if long-distance ISL is down (or not in use)

For more information please refer to Network OS Administration Guide

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