On Fri, Jul 20, 2018 at 10:08 AM, Vijayalakshmi <vijayalakshmi.marudhanayagam@veryxtech.com> wrote:
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, ?????
For that you need to swap to the implicit-null label. Example: mpls lsp 100 192.168.123.4 implicit-null
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
I guess you mean that this works: 192.168.123.0/24 encap mpls 100 via 192.168.200.3 dev ens9 But this doesn't work: 192.168.123.0/24 encap mpls 100 dev ens9 I think this has something to do with ARP resolution being triggered only for IP packets in the Linux kernel. If ens9 is an ethernet interface and you don't specify a nexthop address, the MPLS packets will be sent to the ethernet broadcast address and dropped on the other side (assuming there's only one). If ens9 is a point-to-point interface then your second route should work normally. Regards, Renato.
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@lists.frrouting.org> On Behalf Of Vijayalakshmi Sent: Thursday, July 12, 2018 11:49 PM To: dev@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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