Junos OS

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

Hi adgwytc , 

 

Greetings, 

 

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. 

 

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

Kudos are appreciated too! 

 

Regards, 

Sharat Ainapur

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

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-pppoe-lns-subscriber-enabling.html#:~:text=The%20inline%20service%20(%20si%20)%20interface,MLPPP%20on%20the%20MX%20Series.
2. https://www.juniper.net/documentation/en_US/junos/topics/concept/services-interfaces-naming-overview.html


Hope this helps.



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

Kudos are appreciated too!





Regards,

Sharat Ainapur


Juniper Business Use Only

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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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-interfaces.html#id-configuring-an-inline-service-interface-for-l2tp-lns

It is supported on MX80 as well

https://apps.juniper.net/feature-explorer/feature-info.html?fKey=7397&fn=1%3A1%20LNS%20stateful%20redundancy%20on%20aggregated%20inline%20service%20interfaces

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