[c-nsp] Segment Routing

[Mohan Nanduri]

PHP will happen as they are back to back in your topology. The range
on XR is between 16000-23999. Anything above the range will not be
installed (16000+15001 = 31001).

Cheers,
-Mohan


On Sun, Sep 13, 2015 at 4:44 AM, Mohammad Khalil <eng_mssk at hotmail.com> wrote:
> Hi all
> I came across segment routing and tried to simulate it using the below topology
> CE1 -- XR1 -- XR2 -- CE2
>
> ISIS is the running IGP between the XR boxes and below is the relevant configuration
>
> XR1
> router isis 1
>  is-type level-2-only
>  net 49.0001.0000.0000.0010.00
>  address-family ipv4 unicast
>   metric-style wide
>   segment-routing mpls
>  !
>  interface Loopback0
>   address-family ipv4 unicast
>    prefix-sid index 1001
>   !
>  !
>  interface GigabitEthernet0/0/0/0
>   address-family ipv4 unicast
>
> XR2
> router isis 1
>  is-type level-2-only
>  net 49.0001.0000.0000.0020.00
>  address-family ipv4 unicast
>   metric-style wide
>   segment-routing mpls
>  !
>  interface Loopback0
>   address-family ipv4 unicast
>    prefix-sid index 1002
>   !
>  !
>  interface GigabitEthernet0/0/0/0
>   address-family ipv4 unicast
>
> XR1
> router bgp 1
>  address-family vpnv4 unicast
>  !
>  neighbor 20.20.20.20
>   remote-as 1
>   update-source Loopback0
>   address-family vpnv4 unicast
>   !
>  !
>  vrf MSSK
>   rd 1:1
>   address-family ipv4 unicast
>    redistribute connected
>
> XR2
> RP/0/0/CPU0:Clone#sh run router bgp
> Sun Sep 13 11:37:16.085 UTC
> router bgp 1
>  address-family vpnv4 unicast
>  !
>  neighbor 10.10.10.10
>   remote-as 1
>   update-source Loopback0
>   address-family vpnv4 unicast
>   !
>  !
>  vrf MSSK
>   rd 1:1
>   address-family ipv4 unicast
>    redistribute connected
>
> The issue is that I cannot any labels imposed :
> RP/0/0/CPU0:XRnew#sh cef 20.20.20.20/32 | inc labels
> Sun Sep 13 11:37:37.416 UTC
>      local label 17002      labels imposed {ImplNull}
>
> RP/0/0/CPU0:Clone#sh cef 10.10.10.10/32 | inc labels
> Sun Sep 13 11:37:54.372 UTC
>      local label 17001      labels imposed {ImplNull}
>
> Another weird issue am facing is that when I change the prefix-sid index on both XR boxes to (15001 , 15002 respectively) , no labels are shown at all
>
> RP/0/0/CPU0:XRnew#sh cef 20.20.20.20/32 | inc labels
> Sun Sep 13 11:38:47.211 UTC
>
> Any ideas guys?
>
> Thanks
>
> BR,
> Mohammad
>
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