[c-nsp] NRP2-SV MTU Issue

[Tom Williams]

Hi All,

 

I'm having an issue with an NRP2 Card related to the MTU Size.  We use
the Local Telcos LAN X services to connect our POP sites together, in
this case we have an ATM interconnection to the telco, and at the remote
site we  are provided with an Ethernet connection.  We have had this
loop working for the last few months between and NRP1 card and the Cisco
7200 at the remote site with no issue.   As our needs have grown we now
need to upgrade that older NRP1 card to an NRP2 I moved the
configuration from the NRP1 to the new NRP2 card and when I  moved the
PVC I was no longer able to pass traffic to the remote site with packets
larger then 1480 bytes.  

 

Here is a quick snip of the interface on the NRP2 card

 

interface ATM0/0/0.72 point-to-point

 mtu 1500

 ip address X.X.X.X 255.255.255.252

 no ip redirects

 no ip proxy-arp

 ip ospf network broadcast

 ip ospf cost 1

atm route-bridged ip

 pvc Greensboro 1/72 

  ubr 30000

 !

!  

 

Here is a show version for more information as well

 

Cisco Internetwork Operating System Software 

IOS (tm) C6400R2SP Software (C6400R2SP-G4P5-M), Version 12.3(9d),
RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2005 by cisco Systems, Inc.

Compiled Fri 01-Apr-05 20:47 by dchih

Image text-base: 0x60012AF4, data-base: 0x61304000

 

ROM: System Bootstrap, Version 12.2(20011020:002458) [pgettner-r37 101],
DEVELOPMENT SOFTWARE

BOOTLDR: C6400R2SP Software (C6400R2SP-G4P5-M), Version 12.3(9d),
RELEASE SOFTWARE (fc2)

 

WNSONJU-CORE1 uptime is 29 weeks, 5 days, 10 hours, 31 minutes

WNSONJU-CORE1 uptime since becoming master is 29 weeks, 5 days, 10
hours, 31 minutes

System returned to ROM by power-on

System restarted at 15:56:07 UTC Fri Aug 19 2005

System image file is "mir-disk0:/images/c6400r2sp-g4p5-mz"

 

cisco NRP2SP (NRP2SP) processor with 393216K/65536K bytes of memory.

R7000 CPU at 270MHz, Implementation 39, Rev 2.1, 256KB L2, 2048KB L3
Cache

Last reset from system control processor

X.25 software, Version 3.0.0.

Bridging software.

1 Gigabit Ethernet/IEEE 802.3 interface(s)

1 Serial network interface(s)

1 ATM network interface(s)

256K bytes of non-volatile configuration memory.

 

Configuration register is 0x2101

 

Has anyone ever seen any issues with these cards?  We do have other PVCs
that are connecting some other devices to this card and they seem to
work fine with 1900 Byte packets (the max MTU that the card supports).

 

Any assistance would be great.

 

Tom Williams

-----

Internet Access Solutions Ltd.

1 Greensboro Dr. S.303

Toronto, Ontario

Canada

M9W 1C8

Tel: 416-621-7255 x.208