Cluster:Netgear GBIC issues

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The symptoms

Port trunking on the cairo Netgear GSM712 GBIC ports causes frequent, repeatable delays of a few seconds for no obvious reason. Delays on a single GBIC/pair of GBICs might also be repeatable.

Things to remember

  • Is LACP stable?
  • Do we need LACP for port trunking?
  • Is STP/RSTP on Netgear products stable?
  • Could we try backing down to an earlier firmware? (We did a jump from 2.2.0→2.6.0 recently.)

Things I've tried

  • Auto LACP enabled/disabled
  • STP/RSTP/No spanning-tree
  • Swapping cables
  • Swapped top GBIC
  • Swapped bottom GBICs
  • Bad port 12?
  • Marked all GBIC modules with identifying scratches.
  • STP occassionally puts port in blocking mode when the pauses happen

Tests

Single channel

  • GBIC 1 in port 11 on SW0, GBIC 2 in port 11 on SW1, other GBICs depopulated: Pauses
  • GBIC 1 in port 11 on SW1, GBIC 2 in port 11 on SW0, other GBICs depopulated: Pauses
  • GBIC 1 in port 12 on SW1, GBIC 2 in port 12 on SW0, other GBICs depopulated: Pauses
  • GBIC 1 in port 12 on SW0, GBIC 2 in port 12 on SW1, other GBICs depopulated: Pauses
  • GBIC 1 in port 12 on SW0, GBIC 3 in port 12 on SW1, other GBICs depopulated: Good
  • GBIC 1 in port 12 on SW1, GBIC 3 in port 12 on SW0, other GBICs depopulated: Good
  • GBIC 1 in port 11 on SW0, GBIC 3 in port 11 on SW1, other GBICs depopulated: Good
  • GBIC 1 in port 11 on SW1, GBIC 3 in port 11 on SW0, other GBICs depopulated: Good
  • GBIC 1 in port 11 on SW1, GBIC 4 in port 11 on SW0, other GBICs depopulated: Good
  • GBIC 1 in port 11 on SW0, GBIC 4 in port 11 on SW1, other GBICs depopulated: Good
  • GBIC 1 in port 12 on SW0, GBIC 4 in port 12 on SW0, other GBICs depopulated: Good
  • GBIC 1 in port 12 on SW1, GBIC 4 in port 12 on SW1, other GBICs depopulated: Good
  • GBIC 2 in port 11 on SW0, GBIC 3 in port 11 on SW1, other GBICs depopulated: Pauses
  • GBIC 2 in port 11 on SW1, GBIC 3 in port 11 on SW0, other GBICs depopulated: Pauses
  • GBIC 2 in port 12 on SW1, GBIC 3 in port 12 on SW0, other GBICs depopulated: Pauses
  • GBIC 2 in port 12 on SW0, GBIC 3 in port 12 on SW1, other GBICs depopulated: Pauses
  • GBIC 3 in port 11 on SW0, GBIC 4 in port 11 on SW1, other GBICs depopulated: Good
  • GBIC 3 in port 11 on SW1, GBIC 4 in port 11 on SW0, other GBICs depopulated: Good
  • GBIC 3 in port 12 on SW1, GBIC 4 in port 12 on SW0, other GBICs depopulated: Good
  • GBIC 3 in port 12 on SW0, GBIC 4 in port 12 on SW1, other GBICs depopulated: Good

Bonded channel

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