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Beginner

Does the mpls work on interface serial cisco ASR 901?

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?

2 ACCEPTED SOLUTIONS

Accepted Solutions
Highlighted
Beginner

Hi,I have been working on the

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?

 

 

 

Cisco Employee

Hello Mickolay, MPLS support

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 

 

 

 

4 REPLIES 4
Highlighted
Beginner

Hi,I have been working on the

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?

 

 

 

Beginner

Thank you. You are right.

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.

Cisco Employee

Hello Mickolay, MPLS support

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 

 

 

 

Beginner

Thank you, Nikhil. You are

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

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