Switch back plane utilization ( Packet drop )

k_sinjish · ‎09-23-2010

Hi

we are facing packet drop at some of the interfaces of a 7609 switch .

Output drop rate is keep increasing now . It is mainly effecting on the Cisco SIP ( SPA intertface card instance ) interface

1) Will it happen because of the high utilization of the back plane ?

2) How can we check the backplane utilization of the switch .

3) Is there any other reason for this issue

Regards ,

Sinjish.K

paolo bevilacqua · ‎09-24-2010

You should contact the TAC and provide all the necessary information.

No supposition or diagnosis can be done with a minimal description like your.

k_sinjish · ‎09-24-2010

Hi ,

Thanks for the update.

Can you please suggest me how can i find the current utilization of the Back plane ( Apart from checking each interface utilization and summing up ) .

I am just suspecting this is happening like a bottle neck .

XXXXXXXXX#sh fabric utilization
slot    channel      speed    Ingress %     Egress %
    1          0        20G            1            0
    1          1        20G            0            0
    4          0         8G            0            0
    5          0        20G            0            0
    9          0        20G            0            0

But i dont think the ingress and Egress is zero . If you have any other command set to check the same please suggest me

Regards ,

Sinjish.K

Giuseppe Larosa · ‎09-24-2010

Hello Sinjish,

at least provide

show module

show ver

some SIP linecards are not serviced by the most efficient switching fabric or they miss a DFC

Hope to help

Giuseppe

k_sinjish · ‎09-24-2010

Hi Giuslar ,

Thanks for your response .

Here we have created the instances in the SIP trunk as the below given

service instance 2412 ethernet

encapsulation dot1q 2412

rewrite ingress tag pop 1 symmetric

bridge-domain 2412

!

service instance 2416 ethernet

encapsulation dot1q 2416

rewrite ingress tag pop 1 symmetric

bridge-domain 2416

We also found , if we are increasing the packet size more than 1000 , the drop rate is increasing very much .

I also request you to share me any trouble shooting commands for the SPA ( If any commands effects the normal switch operation please mention that also )

Please find the below switch details :

ROM: System Bootstrap, Version 12.2(17r)S2, RELEASE SOFTWARE (fc1)

BOOTLDR: Cisco IOS Software, c7600s72033_rp Software (c7600s72033_rp-ADVIPSERVICESK9-M), Version 12.2(33)SRD4, RELEASE SOFTWARE (fc2)

XXXXXX uptime is 11 weeks, 4 days, 20 hours, 49 minutes

Uptime for this control processor is 11 weeks, 4 days, 20 hours, 51 minutes

System returned to ROM by s/w reset (SP by power-on)

System restarted at 01:09:07 gmt Mon Jul 5 2010

System image file is "disk1:c7600s72033-advipservicesk9-mz.122-33.srd4.bin"

Last reload type: Normal Reload

isco CISCO7609 (R7000) processor (revision 1.0) with 983008K/65536K bytes of memory.

Processor board ID FOX080703L5

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

Last reset from power-on

1 SIP-400 controller (5 GigabitEthernet).

1 Ethernet interface

57 Virtual Ethernet interfaces

24 Gigabit Ethernet interfaces

2 Ten Gigabit Ethernet 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

************

XXXXXXXX#sh module

Mod Ports Card Type Model Serial No.

--- ----- -------------------------------------- ------------------ -----------

1 16 SFM-capable 16 port 1000mb GBIC WS-X6516A-GBIC SAL10478NCY

5 2 Supervisor Engine 720 (Active) WS-SUP720-3BXL SAD08260HT4

7 0 4-subslot SPA Interface Processor-400 7600-SIP-400 JAE1211B202

8 2 7600 ES+ 7600-ES+2TG3C JAE14190XNM

Mod MAC addresses Hw Fw Sw Status

--- ---------------------------------- ------ ------------ ------------ -------

1 001a.6d39.d7a0 to 001a.6d39.d7af 4.5 7.2(1) 8.7(0.22)SRD Ok

5 0011.21ba.22d8 to 0011.21ba.22db 4.0 8.1(3) 12.2(33)SRD4 Ok

7 001f.6cd8.d980 to 001f.6cd8.d9ff 2.5 12.2(33)SRD4 12.2(33)SRD4 Ok

8 5475.d0d1.bc80 to 5475.d0d1.bc8f 1.3 12.2(33r)SRD 12.2(33)SRD4 Ok

Mod Sub-Module Model Serial Hw Status

---- --------------------------- ------------------ ----------- ------- -------

5 Policy Feature Card 3 WS-F6K-PFC3BXL SAD082605GR 1.3 Ok

5 MSFC3 Daughterboard WS-SUP720 SAD082604YT 2.1 Ok

7/0 5xGE SPA SPA-5X1GE-V2 JAE1213CMF9 1.2 Ok

8 7600 ES+ DFC LITE 7600-ES+3C JAE14170T8G 1.1 Ok

8 7600 ES+ 2x10GE XFP 7600-ES+2TG JAE14190T5I 1.1 Ok

Mod Online Diag Status

---- -------------------

1 Pass

5 Pass

7 Pass

7/0 Pass

8 Pass

Regards ,

Sinjish.K