Sub-interfaces flapping on Cisco 7500

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Jun 27th, 2002
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We have 7500 series routers (below please find “sh ver”), when we add a new subinterface some (if not all) of the existing subinterfaces on the same physical interface flap (go down and then up again), is this something normal, and if not what need to be done to fix this.


Router#sh ver

Cisco Internetwork Operating System Software

IOS (tm) RSP Software (RSP-JSV-M), Experimental Version 12.0(19991015:014550) [shhwang-conn_t 980]

Copyright (c) 1986-1999 by cisco Systems, Inc.

Compiled Sun 28-Nov-99 23:20 by shhwang

Image text-base: 0x60010908, data-base: 0x61326000


ROM: System Bootstrap, Version 11.1(8)CA1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

BOOTFLASH: RSP Software (RSP-BOOT-M), Version 12.0(5)T1, RELEASE SOFTWARE (fc1)


Router uptime is 28 weeks, 1 day, 1 hour, 33 minutes

System returned to ROM by reload at 15:44:41 EDT Tue Sep 18 2001

System restarted at 15:46:29 EDT Tue Sep 18 2001

System image file is "slot0:rsp-jsv-mz.conn_t.2"

Network configuration file is "tftp://xx.xx.xx.xx/change2"


cisco RSP4 (R5000) processor with 65536K/2072K bytes of memory.

R5000 CPU at 200Mhz, Implementation 35, Rev 2.1, 512KB L2 Cache

Last reset from power-on

G.703/E1 software, Version 1.0.

G.703/JT2 software, Version 1.0.

X.25 software, Version 3.0.0.

SuperLAT software (copyright 1990 by Meridian Technology Corp).

Bridging software.

TN3270 Emulation software.

Chassis Interface.

2 GEIP controllers (2 GigabitEthernet).

2 Gigabit Ethernet/IEEE 802.3 interface(s)

123K bytes of non-volatile configuration memory.


20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).

8192K bytes of Flash internal SIMM (Sector size 256K).

No slave installed in slot 3.

Configuration register is 0x2102


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Anonymous (not verified) Thu, 06/27/2002 - 14:13
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This is not normal. It looks like you are running an Experimental

version of code. I'd say it is time to upgrade.


bvance Fri, 06/28/2002 - 03:52
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I saw this same behavior on the 7206VXR slot 0 I/O ports. If a network address were added or changed on the interface or one of its subinterfaces, the interface would "bounce". It also occurred when routing a protocol was enabled or disabled in the slot 0 interface. It turned out to be a code issue that reset the interface when a change was made. Yours is a different hardware platform but it may be a similar thing. If it is a problem you may want to open a TAC case.

bvance Fri, 06/28/2002 - 03:53
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I saw this same behavior on the 7206VXR slot 0 I/O ports. If a network address were added or changed on the interface or one of its subinterfaces, the interface would "bounce". It also occurred when routing a protocol was enabled or disabled in the slot 0 interface. It turned out to be a code issue that reset the interface when a change was made. Yours is a different hardware platform but it may be a similar thing. If it is a problem you may want to open a TAC case.

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