[c-nsp] Cisco 2600 with MPLS, what of MTU?

[Bjørn Mork]

"Lasher, Donn" <DLasher at newedgenetworks.com> writes:

> As I recall, Cisco removed the required "tag-switching" commands in >=
> 12.3 for the 2600 platform. 

Really?  I haven't verified that it actually works, but at least the
commands are there:

c2612b#sh mpls interfaces detail 
Interface Ethernet1/0:
        IP labeling enabled (tdp)
        LSP Tunnel labeling not enabled
        BGP tagging not enabled
        Tagging operational
        Fast Switching Vectors:
          IP to MPLS Fast Feature Switching Vector
          MPLS Feature Vector
        MTU = 1300

c2612b#sh running-config interface ethernet 1/0
Building configuration...

Current configuration : 150 bytes
!
interface Ethernet1/0
 ip address dhcp
 ip access-group 130 in
 ip access-group 131 out
 half-duplex
 tag-switching mtu 1300
 tag-switching ip
end

c2612b#sh ver
Cisco Internetwork Operating System Software 
IOS (tm) C2600 Software (C2600-TELCO-M), Version 12.3(17a), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Mon 12-Dec-05 14:12 by evmiller
Image text-base: 0x80008098, data-base: 0x81257118

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
ROM: C2600 Software (C2600-TELCO-M), Version 12.3(17a), RELEASE SOFTWARE (fc2)

c2612b uptime is 36 weeks, 2 days, 13 hours, 34 minutes
System returned to ROM by power-on
System restarted at 10:36:38 MET-DST Mon May 22 2006
System image file is "flash:c2600-telco-mz.123-17a.bin"

cisco 2612 (MPC860) processor (revision 0x101) with 61440K/4096K bytes of memory.
Processor board ID JAB03360A2Y (3341091844)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
2 Ethernet/IEEE 802.3 interface(s)
1 Token Ring/IEEE 802.5 interface(s)
2 Serial network interface(s)
32K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102
This image supports System Controller functionality


Now, we only need someone to implement tag switching on Token Ring :-)

c2612b(config)#interface tokenRing 0/0
c2612b(config-if)#tag-switching ip       
% MPLS not supported on interface TokenRing0/0



Bjørn