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I have put in service a new SUP720-3BXL on a 6509 to replace BGP routing on 7204 VXR with NPE-G1.

So, I have severals SLB working on the 6509 with SUP1A.

I have replaced the sup1A with SUP720 3BXL.

I have configured a BGP Sessions with one of our provider and bring it up.

Now, I have some trouble with SLB which are switching to failed when I begin to advertised the route concerned by this SLB.

Here are the error logs :

Jun 16 16:15:14: %SLB-6-REAL: Real A.B.C.D (SERVERFARM) has changed state to FAILED

Jun 16 16:15:50: %SLB-6-REAL: Real A.B.C.E (SERVERFARM) has changed state to FAILED

Jun 16 16:16:27: %SLB-6-REAL: Real A.B.C.F (SERVERFARM) has changed state to FAILED

Here the part of the conf concerned by that :

ip slb serverfarm SERVERFARM

nat server

predictor leastconns


real A.B.C.D



real A.B.C.E



real A.B.C.F



real A.B.C.G

no inservice


ip slb vserver EU

virtual A.B.C.H tcp www

serverfarm SERVERFARM

sticky 600



ip slb vserver FR

virtual A.B.C.I tcp www

serverfarm SERVERFARM

sticky 600



ip slb vserver COM

virtual A.B.C.J tcp www

serverfarm SERVERFARM

sticky 600


ip route A.B.C.0 X.X.X.X

And a show ver :

System returned to ROM by reload at 07:25:46 UTC Mon May 4 2009 (SP by reload)

System restarted at 11:01:58 CEST Mon May 11 2009

System image file is "disk0:s72033-advipservicesk9_wan-mz.122-18.sxf3.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

cisco WS-C6509 (R7000) processor (revision 3.0) with 983008K/65536K bytes of memory.

Processor board ID SAL0804TEAF

SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache

Last reset from s/w reset

SuperLAT software (copyright 1990 by Meridian Technology Corp).

X.25 software, Version 3.0.0.

Bridging software.

TN3270 Emulation software.

7 Virtual Ethernet/IEEE 802.3 interfaces

144 FastEthernet/IEEE 802.3 interfaces

10 Gigabit Ethernet/IEEE 802.3 interfaces

1917K bytes of non-volatile configuration memory.

8192K bytes of packet buffer memory.

65536K bytes of Flash internal SIMM (Sector size 512K).

Configuration register is 0x2102

Do I have misconfigured the SLB ?

Thank for your answer,

Hall of Fame Super Silver

Re: SUP720-3BXL BGP Routing / SLB ISSUE

Hello Yousri,

your configuration looks like fine.

You have changed the supervisor HW and the IOS release.

I've checked release notes and software based IP SLB is supported with your supervisor and your IOS image.

However, I would try to install a newer image you may be hitting a SW bug. What image to choice depends from the modules that are in the chassis.

Hope to help


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