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ISL Congestion on Brocade G720 Switches in Long‑Distance SAN Environments

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san
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Applies to

  • Brocade G720 SAN switches
  • Fabric OS 9.2.2c

Issue

  • Congestion and oversubscription alerts on Brocade G720 ISL ports in long-distance SAN environments.
  • The ISLs are correctly trunked and remain operational.

switch:admin> islshow
1:22->22 10:00:xx:xx:xx:cc:da:0b switch sp:8.000Gb w:16.000G TRUNK CR_RECOV 93576m

switch:admin> trunkshow
1:22->22 10:00:xx:xx:xx:xx deskew 9 E-Port MASTER
23->23 10:00:xx:xx:xx:xx:da:0b: deskew 13

  • MAPS reporting PORT_BANDWIDTH==OVERSUBSCRIBED alerts
  • ISL bandwidth demand significantly exceeds the available trunk bandwidth
  • ISL ports are remaining online and stable
  • ISLs reporting CR_RECOV (Credit Recovery) state
  • No link down events or buffer allocation errors

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