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my_engr
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Ping not working with Large size packets.

Tue Jul 03, 2012 8:48 am

Hi,

I am connecting a cisco device with huawei device.
The issue is when i ping with normal size packets (56 bytes) its ok.
But when i increase the packet size above 1500 it doesnot works.
MTU on both size is configured as 4096. I have also checked by varying MTU size, but still the same.
Please help out.


Thanking in Advance

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jdsilva
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Re: Ping not working with Large size packets.

Tue Jul 03, 2012 8:59 am

This doesn't belong in IP Communications as it's not voice/video related. Moving to Cisco General.

my_engr
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Re: Ping not working with Large size packets.

Tue Jul 03, 2012 11:28 am

Any suggestions appreciated....:)

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srg
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Re: Ping not working with Large size packets.

Tue Jul 03, 2012 11:47 am

what devices? how are they configured and how are they connected to each other?
som om sinnet hade svartnat för evigt.

my_engr
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Re: Ping not working with Large size packets.

Tue Jul 03, 2012 2:20 pm

what devices? how are they configured and how are they connected to each other?


Both are routers...One End Cisco other end Huawei. The link is point2point link using dark fiber.
Both are configured with MTU of 4096 and ip's, nothing else...

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srg
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Re: Ping not working with Large size packets.

Tue Jul 03, 2012 2:44 pm

show interfaces etc show 4096 mtu? What models are they?
som om sinnet hade svartnat för evigt.

my_engr
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Re: Ping not working with Large size packets.

Tue Jul 03, 2012 2:59 pm

show interfaces etc show 4096 mtu? What models are they?


Huawei Device = NE 40 E

Cisco Device = ME 460

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srg
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Re: Ping not working with Large size packets.

Tue Jul 03, 2012 3:03 pm

dont know what ME 460 is. and again, do show interface identify mtu 4096? we need to know more of your setup and config to help you.
som om sinnet hade svartnat för evigt.

my_engr
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Re: Ping not working with Large size packets.

Tue Jul 03, 2012 3:15 pm

dont know what ME 460 is. and again, do show interface identify mtu 4096? we need to know more of your setup and config to help you.


Me460 is used as UPE and NE 40 is used as aggregator.
Customer Circuits are attached to UPE and then end up in L3VPN on Aggregator.

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mellowd
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Re: Ping not working with Large size packets.

Tue Jul 03, 2012 3:46 pm

Still waiting for you to show output of interface mtu. It's been asked numerous times already

my_engr
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Re: Ping not working with Large size packets.

Wed Jul 04, 2012 10:20 am

Still waiting for you to show output of interface mtu. It's been asked numerous times already


Issue Solved, Cisco guy was changing MTU on physical interface instead of interface Vlan , as he has configured his interface as switchport trunk and passing Vlans.


Thanks all for your interest. :)

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Re: Ping not working with Large size packets.

Wed Jul 04, 2012 11:22 am

Problem would've been resolved quickly if you had just given us the MTU like was asked so many times

my_engr
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Re: Ping not working with Large size packets.

Wed Jul 04, 2012 11:28 am

Problem would've been resolved quickly if you had just given us the MTU like was asked so many times


Dear I dont have direct access to cisco devices, i passed as i heard from Cisco guy.
And he was not willing to provide his logs, until today when i saw the issue at his end.

Thanks Any how, I will be careful next time...Cheers :D

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Carlitos_30
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Re: Ping not working with Large size packets.

Sat Jul 14, 2012 10:26 pm

They router shoulnd't just fragment the packet?

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Re: Ping not working with Large size packets.

Sun Jul 15, 2012 7:59 am

Carlitos_30 wrote:They router shoulnd't just fragment the packet?

Pings are often not fragmented I believe. That would be quite useless in most situations.
http://reggle.wordpress.com

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Carlitos_30
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Re: Ping not working with Large size packets.

Sun Jul 15, 2012 11:57 am

At least Cisco routers fragment pings.

chouxi
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Re: Ping not working with Large size packets.

Fri Jul 20, 2012 4:24 am

I have the same problem
http://www.ingellen.com

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