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Junos

SI interface for L2TP and AE ports

‎06-21-2020 01:31 PM

Hi all,

 

Is it possible to configure an SI interface on an aggreagted ethernet port for L2TP?

 

Downstream LAC connects to a switch on a VLAN and then 2 x 10g ports connect to the MX104 on ae0.

I cannot seem to find docs that say whether you can or not. I thought the SI interfaces was tied to a physical port and therefore would not work with an ae interface. Could you let me know if this is possible please?

 

Cheers

5 REPLIES 5
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Junos

Re: SI interface for L2TP and AE ports

‎06-21-2020 07:14 PM

Hi 

 

 

As per my understanding, you are trying to configure the si on the MX routers.

If yes, per my knowledge I think we will not be able to do this configuration on the aggregated ethernet (AE) bundle as you would need a physical interface to carry the L2TP tunnel packets.

 

The inline service interface is a virtual physical service interface that resides on the Packet Forwarding Engine.
This si interface, referred to as an anchor interface, makes it possible to provide L2TP services without a special services PIC. The inline service interface is supported only by MPCs on MX Series routers.  Four inline service interfaces are configurable per MPC-occupied chassis slot.

Link: Enabling Inline Service Interfaces  and also L2TP Minimum Configuration .

 

Hope this helps. Smiley Happy

 

Please mark "Accept as solution" if this answers your query. 

Kudos are appreciated too! 

 

Regards, 

Sharat Ainapur

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Junos

Re: SI interface for L2TP and AE ports

‎06-22-2020 02:54 PM

Hi Sharat,

 

Apologies, I can accept the previous reply as a solution in a while, I just need to confirm the following please....

 

MX80 with the following hardware:

m Version Part number Serial number Description
Chassis F3594 MX80
Midplane REV 08 711-031594 ZL2078 MX80
PEM 0 Rev 04 740-028288 VC03685 AC Power Entry Module
PEM 1 Rev 04 740-028288 VC02561 AC Power Entry Module
Routing Engine BUILTIN BUILTIN Routing Engine
TFEB 0 BUILTIN BUILTIN Forwarding Engine Processor
QXM 0 REV 05 711-028408 ZK0991 MPC QXM
FPC 0 BUILTIN BUILTIN MPC BUILTIN
MIC 0 BUILTIN BUILTIN 4x 10GE XFP
PIC 0 BUILTIN BUILTIN 4x 10GE XFP
Xcvr 0 REV 01 740-011613 M1402130132 XFP-10G-SR
Xcvr 3 REV 01 740-011613 M1402130176 XFP-10G-SR
FPC 1 BUILTIN BUILTIN MPC BUILTIN
Fan Tray Fan Tray

 

 

And when trying to commit with an si interface I get the following error:

 

error: Service interface si-0/0/0 is not supported on MX80
Service device pool lns
error: configuration check-out failed

 

However, as I am sure you are aware, when configuring an L2TP group-profile this is a mandotory statement.

 

Can you let me know please if there is a card missing as the MPC is inbuilt?

 

Thanks

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Junos
Solution
Accepted by topic author adgwytc
‎06-24-2020 11:55 AM

Re: SI interface for L2TP and AE ports

‎06-22-2020 06:57 PM
Hi adgwytc,



Greetings !



I believe the SI interfaces are on 3D series cards only.


* si-Services inline interface, configured on MX3D Series routers only.

* The following MPC2 slots are supported:

1. The MPC2-3D contains two lookup engines, each with two si interfaces.
2. The MPC1-3D contains only one lookup engine and it hosts all four si interfaces.

For further details, refer the links:

1. https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/mlppp-mx-inline-service-....
2. https://www.juniper.net/documentation/en_US/junos/topics/concept/services-interfaces-naming-overview...


Hope this helps.



Please mark "Accept as solution" if this answers your query.

Kudos are appreciated too!





Regards,

Sharat Ainapur


Juniper Business Use Only
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Junos

Re: SI interface for L2TP and AE ports

‎06-22-2020 07:06 PM

Hello,

 

MX104 contains the same forwarding engine as MPC2 and si-* interfaces are fully supported:

On MX80 and MX104 routers, you can configure only four inline services physical interfaces as anchor interfaces for L2TP LNS sessions: si-1/0/0, si-1/1/0, si-1/2/0, and si-1/3/0. You cannot configure si-0/0/0 for this purpose on MX80 and MX104 routers.

Please try configuring si-1/*/0 and let us know if it works.

 

Best regards,

Sergii

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Junos

Re: SI interface for L2TP and AE ports

‎06-22-2020 08:45 PM

Hello,

 

Short answer is no.

The long answer is if You are after redundancy for SI interfaces, You can use  1:1 Aggregated Service Interface (ASI) for L2TP

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/l2tp-lns-inline-service-interface...

It is supported on MX80 as well

https://apps.juniper.net/feature-explorer/feature-info.html?fKey=7397&fn=1%3A1%20LNS%20stateful%20re...

However, ASI - or multiple SI - on MX80 (and MX104) does not make much sense since MX80 has a single forwarding chip, and SI/ASI is a feature of the forwarding chip as a whole, not a feature of individual port. In other words, if You have si-1/0/0 interface and ge-1/0/0 interface, then when ge-1/0/0 goes down, si-1/0/0 does not.

HTH

Thx

Alex

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