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RE: [MPLS-OPS] tag-switching mtu command on cisco IOS

  • From: "Dennis J. Hartmann" <dennisjhartmann@hotmail.com>
  • Date: Fri, 20 Feb 2004 13:59:43 -0500
  • Organization: White Pine Communications
  • Resent-Date: Fri, 20 Feb 2004 14:41:57 -0500
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Title: CCIE Logo 편지지
    Test it with an extended ping.  Choose yes to the DF option.  If you M.M.M.M.M back, the MTU was exceeded.  Let the rest of the group know how your test turns out.
 

Sincerely,

 

Dennis J. Hartmann

White Pine Communications

CCSI/CCIP/CCNP/CCDP/CCNA/CCDA

Cisco IP Voice Support & Design Specialist

Cisco Optical, VPN & IDS Specialist

MCSE

 

 

From: ??? [mailto:hshong@innet.co.kr]
Sent: Sunday, February 15, 2004 9:06 PM
To: mpls-ops@mplsrc.com
Subject: [MPLS-OPS] tag-switching mtu command on cisco IOS

Hi Everyone~~
 
I have a question about cisco's " tag-switching mtu" command.
Please let me know the good answer and reason...
 
-----------------------------------------------------------------------------
(( Diagram ))
 
 --[IP Network]----(e0/0) "CISCO ROUTER" (e0/1)----[ MPLS Network ]----
 
(( Situation -1 ))
(1) Configuration
     - IP datagram mtu on e0/1 = 1500 Byte (Default Configuration)
     - "tag-swtiching mtu 1504" on e0/1 interface.
 
(2) IP Packet Arrived from e0/0
     -Size : 1500-Byte 
     -DF Bit Set : No 
     -Forwarding Interface : e0/1 
     -1 Label will be imposed.(4 byte overhead)
 
Will the Cisco router fragment this IP packet before sending it to e0/1?
or send 1504 Labeled packet without fragmentation. ( override IP mtu 1500 )
 
(( Situation -2 ))
(1) Same Configuration, Same Diagram to Situation-1
(2) IP Packet Arrived from e0/0
     -Size : 1500-Byte 
     -DF Bit Set : No 
     -Forwarding Interface : e0/1 
     -2 Label will be imposed.(8 byte overhead .)
 
Will the Cisco router fragment this IP packet before sending it to e0/1?
-----------------------------------------------------------------------------
 
Thanks
Best Regards.
 
 
==================================================
Huisuk Hong
System Engineering
==================================================