[c-nsp] Mpls with layer-2 in between

[Shawn L]

Unfortunately, I already have that in there, on both sides.

mpls ldp router-id Loopback0 force

But it's still trying to use the vlan1 interface


On Mon, Oct 12, 2020 at 2:48 PM Scott Miller <fordlove at gmail.com> wrote:

> On the 3850, can you do something like:
>
> mpls ldp router-id Loopback0
>
> would probably take bouncing all the ldp neighbors for it to take effect.
>
> On Mon, Oct 12, 2020 at 12:38 PM Shawn L <shawn at rmrf.us> wrote:
>
>> I have kind of a strange situation.  Trying to figure out what to do
>> moving
>> forward, and not sure what the best (or quickest) way to solve the issue.
>>
>> I have a mpls cross-connect (pseudowire) between 2 sites.  The link comes
>> up, but I can't pass any traffic.
>>
>> sh mpls l2transport vc - shows the connection is up
>> ping mpls pseudowire x.x.x.x YY reply mode ipv4 - gives me a time-out.
>>
>> The link goes from an ASR920 - Cisco 3850 ------- Cisco 3850 - ASR920
>>
>> The long dashed line is a 40-gig layer-2 link between the 2 Cisco 3850
>> switches.  Both switches run eigrp and terminate mpls links just fine; ie
>>
>> interface TenGigabitEthernet1/0/4
>>  no switchport
>>  ip address 10.10.0.73 255.255.255.252
>>  mpls ip
>>  mpls label protocol ldp
>>
>> ASR920 ---- 3850 ---- ASR920 pseudowires work fine.  It's an issue when
>> the
>> 2nd 3850 comes into the mix.
>>
>> When I do a traceroute from end-to-end, I see the vlan 1 interface of the
>> 3850, not the loopback interface.  So, I'm guessing it's taking the
>> layer-2
>> path instead of using the loopback interfaces and routing it.
>>
>> The best way to fix it is to remove the 3850s from the equation and put in
>> real routers.  Unfortunately that means I can't utilize the 40 gig link to
>> the other site.
>>
>> Is it possible to have a layer-2 connection in-between 2 mpls speaking
>> routers?  ie
>>
>> ASR920 --- 'new' router --- 3850--------3850 -- 'new' router ---- ASR920
>>
>> Or, is there a way to tell the 3850s to route the connection instead of
>> switch it (and not break switching on them)?
>>
>> Thanks
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>