[c-nsp] Segment Routing

[dip]

Hey Mohammad,

->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}

[Dip] Hey Mohammad, since the routers are directly connected, PHP will
happen as you can see label imposed is Implicit Null.

-> 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

[Dip] Usually the default SRGB range on the IOS-XR boxes is between
16,000-23,999
. Since you are setting the Index value to 15001 and 15002 , the prefix-sid
value comes out to be 16000+15001 (Base+ Index) i .= 31,001 and 31002 which
are outside the SRGB global-block range and am suspecting that's why you
are seeing no labels assigned I wrote on this topic a while back

http://packetpushers.net/yet-another-blog-about-segment-routing-part-1/






On Sun, Sep 13, 2015 at 3:44 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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