[dev] MPLS SWAP and POP configuration issue

Vijayalakshmi vijayalakshmi.marudhanayagam at veryxtech.com
Fri Jul 20 09:08:31 EDT 2018


Hi,

I have found the issue in my configuration and now able to perform 
PUSH/SWAP/POP operations for MPLS via Linux Kernel.

And I tested the same with FRR and here I am not sure about the 
configuration for popping a MPLS label.

To add label via zebra,
*ip route 192.168.133.0/24 192.168.200.3 label 100*

To swap label via zebra,
*mpls lsp 100 192.168.123.4 200*

To remove label via zebra,
*?????*

Please let me know the configuration if anyone knows.

Thanks,
Vijayalaskhmi

PS:
The issue observed with Linux configuration of static route with nexthop 
as IP address works fine but nexthop as interface (dev) does not work.

As the following works fine,
*192.168.123.0/24  encap mpls  100 via 192.168.200.3 via 192.168.200.3 
dev ens9

*but this does not work,
*192.168.123.0/24  encap mpls  100 via 192.168.200.3 dev ens9


*
On 7/16/2018 7:15 PM, Vijayalakshmi wrote:
> Hi Kishore,
>
> Thanks for your reply.
>
> I tried the same with Linux MPLS via iproute2 configuration. Still the 
> behavior is same.
> So it is clear that the issue is not with FRR.
>
> Let me fix the issue in my Linux kernel and get back to you if I need 
> any support.
>
> Regards,
> Vijayalakshmi
>
> On 7/13/2018 9:45 PM, Kishore Aramalla wrote:
>>
>> Vijayalakshmi, Can you share your configuration.
>>
>> Best,
>>
>> Kishore
>>
>> *From:*dev <dev-bounces at lists.frrouting.org> *On Behalf Of *Vijayalakshmi
>> *Sent:* Thursday, July 12, 2018 11:49 PM
>> *To:* dev at lists.frrouting.org
>> *Subject:* [dev] MPLS SWAP and POP configuration issue
>>
>> Hello,
>>
>> We are currently working with simulating a PE router in MPLS 
>> architecture.
>> We run zebra and ldp with below configuration
>> and facing issues in swapping and popping of label in zebra.
>>
>> In my MPLS table I have the following entries,
>>
>> zebra_2# show mpls table
>>  Inbound                            Outbound
>>    Label     Type          Nexthop     Label
>> --------  -------  ---------------  --------
>>       16      LDP    192.168.100.2         3
>>       17   Static    192.168.100.2        18
>>
>> But still zebra is not swapping the label and also not forwarding the 
>> received traffic (inbound label 16/17)to the respective nexthop.
>>
>> Is there any special command to activate mpls configuration ?
>> Can someone help us in a configuring zebra MPLS to pop label and swap 
>> label?
>>
>> Thanks,
>> Vijayalakshmi
>>
>

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