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

Hi Renato, I already set and verified those parameters. My topology is PE1 Configuration: root@frr:/usr/local/etc/quagga# modprobe mpls-router mpls-iptunnel root@frr:/usr/local/etc/quagga# sysctl -p /etc/sysctl.d/90-routing-sysctl.conf net.ipv4.conf.all.forwarding = 1 net.ipv6.conf.all.forwarding = 1 net.mpls.conf.ens3.input = 1 net.mpls.conf.ens4.input = 1 net.mpls.conf.ens9.input = 1 net.mpls.conf.ens10.input = 1 net.mpls.platform_labels = 100000 root@frr:/usr/local/etc/quagga# ip route default via 192.168.13.1 dev ens3 proto static 192.168.13.0/24 dev ens3 proto kernel scope link src 192.168.13.42 *192.168.123.0/24 encap mpls 100 via 192.168.200.3 dev ens9* 192.168.200.0/24 dev ens9 proto kernel scope link src 192.168.200.2 root@frr:/usr/local/etc/quagga# PE2 Configuration: root@frr:~/frr-4.0-vPE# modprobe mpls-router mpls-iptunnel root@frr:~/frr-4.0-vPE# sysctl -p /etc/sysctl.d/90-routing-sysctl.conf net.ipv4.conf.all.forwarding = 1 net.ipv6.conf.all.forwarding = 1 net.mpls.conf.ens3.input = 1 net.mpls.conf.ens4.input = 1 net.mpls.conf.ens9.input = 1 net.mpls.conf.ens10.input = 1 net.mpls.platform_labels = 100000 root@frr:~/frr-4.0-vPE#root@frr:~/frr-4.0-vPE# ip route default via 192.168.13.1 dev ens3 proto static 192.168.13.0/24 dev ens3 proto kernel scope link src 192.168.13.43 192.168.100.0/24 dev ens4 proto kernel scope link src 192.168.100.3 192.168.111.0/24 dev ens10 proto kernel scope link src 192.168.111.3 192.168.200.0/24 dev ens9 proto kernel scope link src 192.168.200.3 root@frr:~/frr-4.0-vPE# ip route default via 192.168.13.1 dev ens3 proto static 192.168.13.0/24 dev ens3 proto kernel scope link src 192.168.13.43 192.168.111.0/24 dev ens10 proto kernel scope link src 192.168.111.3 192.168.200.0/24 dev ens9 proto kernel scope link src 192.168.200.3 root@frr:~/frr-4.0-vPE# ip -f mpls route show *100 dev ens10* root@frr:~/frr-4.0-vPE# I have a route in Host (192.168.13.40) for network 192.168.123.0/24 as nexthop 192.168.13.42 Now I am sending ping from with destination IP 192.168.123.3 In PE1: Receiving ICMP request in ens3 (13.42) Receiving ICMP request with MPLS label 100 in ens9(200.2) In PE2: Receiving ICMP request with MPLS label 100 in ens9(200.3) But ens9 is not forwarding the ICMP request via any other available interface. Expected behavior is that, it should pop the label 100 and send frame via ens10. Please let know your views. Thanks, Vijayalakshmi On 7/16/2018 7:59 PM, Renato Westphal wrote:

Did you enable MPLS processing on your interfaces?

Please check this link: https://github.com/FRRouting/frr/blob/frr-5.0.1/doc/developer/building-frr-o...

Cheers, Renato.

On Mon, Jul 16, 2018 at 10:45 AM, Vijayalakshmi <vijayalakshmi.marudhanayagam@veryxtech.com> 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

_______________________________________________ dev mailing list dev@lists.frrouting.org https://lists.frrouting.org/listinfo/dev

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

_______________________________________________ dev mailing list dev@lists.frrouting.org https://lists.frrouting.org/listinfo/dev

-- Renato Westphal