About Mitrixsen

Mitrixsen · 10-07-2026

Hello, everyoneI have a question about how the control word ensures proper load balancing in an MPLS core." Routers can perform MPLS payload inspection to determine what the payload is. Based on the type of payload, the router can decide how to load-...

Mitrixsen · 10-07-2026

Hello, everyoneI have a quick question. One of the use cases for the MPLS control word is fragmentation."The fifth reason for the control word is the correct functioning of the fragmentation and reassembly of the frames. The PE routers can indicate w...

Mitrixsen · 10-06-2026

Hello, everyoneI've been studying EVCs for the past few days and there are a lot of things that you can do with the received VLAN tags. You can pop a tag, you can pop two tags, you can push tags, and even translate them.I've used all of these options...

Mitrixsen · 10-03-2026

Hello, everyoneI understand that EoMPLS can operate in two modes - port mode and VLAN mode. VLAN-tunneled interfaces are VC type 4 (0x0004), and port interfaces are VC type 5, or 0x0005.I have a simple xconnect built between two routers. This xconnec...

Mitrixsen · 09-29-2026

Hello, everyoneI have this simple topology. P-1 and P2 are customers with subinterfaces in VLAN 10.I haven't gotten to service instances yet, all I am configuring is a simple subinterface-based xconnect.-------R1--------interface GigabitEthernet1.10 ...

Mitrixsen · 10-04-2026

Hello @Harold Ritter,Thank you. Is there any use case for this? Does it affect anything major if the VC Type is set manually to 4?David

Mitrixsen · 09-17-2026

Hello @Harold Ritter Again, that's correct.. The part that confused me was that XR was using an action of Pop instead of No label which didn't make sense to me since the remote side didn't advertise the implicit null label to it in the first place. X...

Mitrixsen · 09-17-2026

Hello @Harold Ritter Spot on... XE was happily allocating a label despite me not configuring send-label on it while XR just refused to do so unless I specifically configured the peering over labeled-unicast.Thank you so much guys for the support here...

Mitrixsen · 09-16-2026

Hello,XR should generate an implicit null label. Right now, its not generating any at all which forces the other routers to use "No Label" as the outgoing label, thus they remove all labels and no PHP occurs.Thank youDavid

Mitrixsen · 09-15-2026

Hey, everyone.Thank you all for your replies.Do we know what the general consensus here, is? Like @DFWTechGuy stated, XR requires /32 prefixes for the BGP next hops. This happens even without inter-AS MPLS.However, IOS-XE doesn't strictly require /32...

Member Since	‎01-11-2022 07:57 AM
Date Last Visited	‎10-04-2026 11:49 PM
Posts	274
Total Helpful Votes Received	45

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MPLS Control Word - Load Balancing

MPLS Control Word - Fragmentation

L2VPN EVC Services and Options

EoMPLS VC Type 4 and VC Type 5

IOS-XE stripping the VLAN header when sending data through MPLS

Re: EoMPLS VC Type 4 and VC Type 5

Re: MPLS Inter-AS Option B with multiple links

Re: IOS-XR Refusing to allocate a label for a prefix in MPLS Inter-AS

Re: IOS-XR Refusing to allocate a label for a prefix in MPLS Inter-AS

Re: MPLS Inter-AS Option B -> /32 routes for the next-hop?