[f-nsp] Router Becomes Unresponsive

[Chris O'Brien]

Hi,

I was looking for some feedback on a strange issue. We are performing a
router upgrade. On the new gear, when certain BGP peers are established,
the router becomes unresponsive via telnet and the network encounters heavy
packet loss/latency. CPU shows idle and the log just shows interfaces
flapping. Serial access is OK. When you turn these BGP peers down, the
issue goes away. When you turn them back up, the issue returns. It is very
reproducible.

Configs are the same.

Here is our current setup--

SL M1: NI-MLX-32_MR Management Module Active (Serial #:, Part #:
 35639-300C):
Boot     : Version 5.3.0T165 Copyright (c) 1996-2009 Brocade Communications
Systems, Inc.
Compiled on Nov 16 2011 at 10:05:30 labeled as xmprm05300
 (517880 bytes) from boot flash
Monitor  : Version 5.3.0T165 Copyright (c) 1996-2009 Brocade Communications
Systems, Inc.
Compiled on Nov 16 2011 at 10:04:52 labeled as xmb05300
 (524496 bytes) from code flash
IronWare : Version 5.3.0aT163 Copyright (c) 1996-2009 Brocade
Communications Systems, Inc.
Compiled on Apr  6 2012 at 10:27:24 labeled as xmr05300a
 (8063716 bytes) from Primary
Board ID : 00 MBRIDGE32 Revision : 35
916 MHz Power PC processor 7447A (version 8003/0101) 166 MHz bus
512 KB Boot Flash (AM29LV040B), 32 MB Code Flash (MT28F128J3)
2048 MB DRAM INSTALLED
2048 MB DRAM ADDRESSABLE

And, we are migrating to--

SL M1: BR-MLX-MR2-X Management Module Active (Serial #: , Part #:
60-1002375-06):
Boot     : Version 5.6.0T165 Copyright (c) 1996-2013 Brocade Communications
Systems, Inc.
Compiled on Sep 20 2013 at 16:42:38 labeled as xmprm05600
 (516258 bytes) from boot flash
Monitor  : Version 5.6.0T165 Copyright (c) 1996-2013 Brocade Communications
Systems, Inc.
Compiled on Sep 20 2013 at 16:41:56 labeled as xmb05600
 (534157 bytes) from code flash
IronWare : Version 5.6.0dT163 Copyright (c) 1996-2013 Brocade
Communications Systems, Inc.
Compiled on Jul 24 2014 at 22:51:20 labeled as xmr05600d
 (9442445 bytes) from Primary
Board ID : 00 MBRIDGE Revision : 37
1666 MHz Power PC processor 7448 (version 8004/0202) 166 MHz bus
512 KB Boot Flash (MX29LV040C), 128 MB Code Flash (MT28F256J3)
4096 MB DRAM INSTALLED
4096 MB DRAM ADDRESSABLE
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