Does the mpls work on interface serial cisco ASR 901?

[mickolay_net]

Cisco ASR 901

Cisco A901-12C-FT-D

asr901-universalk9-mz.154-2.S.bin

(config)int ser 0/0:0
(config-if)#mpls ip
  MPLS not supported on interface Serial0/0:0

Нow to configure MPLS on serial interface?

[CSABA GARAI · Accepted solution]

Hi,

I have been working on the same scenario.

Putting serial interface into multilink ppp group the mpls tag switching will be available.

!

interface Serial0/0:0
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 1

!

interface Multilink1
  mpls ip
 ppp multilink
 ppp multilink group 1

!

It seems that the TDM based interfaces - including MPPP - only support maximum size MTU of 1500 bytes,however.

Unfortunately 1500 bytes is not enough for most MPLS implementations.

The question is:

Is it possible to increase the MTU on MPPP interfaces?

[mickolay_net]

Thank you. You are right. Configuration multilink - it works. About increase mtu for mpls on interface serial:

(config-if)#mpls mtu ?
  <64-1500>  MTU (bytes)
  override   Override mpls mtu maximum of interface mtu

SWP-ACC-SIX(config-if)#mpls mtu override ?
  <1501-1580>  MTU (bytes)  ================> mtu is 1500 and mpls mtu can be configured upto 1580.

[Nikhil Kapoor · Accepted solution]

Hello Mickolay, 

MPLS support on ASR901 is supported only on SVI. Its is not yet enabled for E1/ Serail interfaces. 

In Cisco ASR 901 router, mpls ip is configured only on switch virtual interface (SVI). The router supports only a maximum of 60 MPLS enabled SVI interfaces.

Please find below link suggesting the same. 

http://www.cisco.com/c/en/us/td/docs/wireless/asr_901/Configuration/Guide/b_asr901-scg/b_asr901-scg_chapter_01110.html#con_1053120

You can bind the interface in multilink and enable MPLS on it. 

HTH, 

Nikhil 

[mickolay_net]

Thank you, Nikhil. You are right. Configuration multilink - it works. I knew about this but I think that this is not the only solution.