Changing MPLS MTU on A5500-HI not possible

[MichaelM55]

Hello,

for MPLS, we have A5500-HI switches and some A5900 switches. On A5500-HI it is not possible to change the MPLS MTU

• HP A5500-48G-4SFP HI with "Comware Software, Version 5.20.99, Release 5501P12"

• dis interface Vlan-interface 2016
  

  Vlan-interface2016 current state: UP
  Line protocol current state: UP
  Description: Vlan-interface2016 Interface
  The Maximum Transmit Unit is 1500

• interface Vlan-interface2016
   ip address 10.20.1.13 255.255.255.254
   ospf network-type p2p
   ospf bfd enable
   mpls
   mpls ldp

  • mpls mtu ?

  • INTEGER<46-65535>  MTU value

• mpls mtu 9216

• Warning: Setting MPLS MTU larger than the interface MTU may result in packet drops.
  Error: The operation is not supported.

• mtu ?

•   INTEGER<46-1500>  MTU value

=> So maximum values is 1500. Is this a limitation within Comware 5 (which will be fixed within the Comware 7 release for A5500-HI)?

In contrast

• HP 5900AF-48XG-4QSFP+ with "System image version: 7.1.045, Release 2418P06"
  

  interface Vlan-interface2012
   ip address 10.20.1.4 255.255.255.254
   ospf network-type p2p
   ospf bfd enable
   ospf 10 area 0.0.0.0
   mpls enable
   mpls mtu 9216
   mpls ldp enable

• mtu ?

•  INTEGER<128-9008>  MTU value (in bytes) 

• Interesting, this one is possible within Comware 7:

• interface Vlan-interface2012
   mtu 9008
   ip address 10.20.1.4 255.255.255.254
   ospf network-type p2p
   ospf bfd enable
   ospf 10 area 0.0.0.0
   mpls enable
   mpls mtu 9216
   mpls ldp enable

  • There´s no warning like that one from the A5500-HI, i.e.:

  Warning: Setting MPLS MTU larger than the interface MTU may result in packet drops.
  Error: The operation is not supported.

• dis interface Vlan-interface 2012

• Vlan-interface2012
  Current state: UP
  Line protocol state: UP
  Description: Vlan-interface2012 Interface
  Bandwidth: 10000000 kbps
  Maximum transmission unit: 9008

• dis mpls interface

• Interface               Status       MPLS MTU
  Vlan2012                Up           9216