7 votes
Accepted

How does a Juniper PE associate frames from the CE with correct route in <VPN_name>.l2vpn.0 table in case of Kompella L2 VPNs?

There are two labels, so as traffic ingresses the PE from the CE there is a double push. Inner Label Every interface gets a label from that L2VPNs label block. The inner label is based on this ...
Jordan Head's user avatar
  • 7,099
5 votes

What's the difference between L2TP and L2TPv3?

Let's say that it is a 'new protocol heavily based on L2TPv2'. It shares a lot of the messages, constructs, flows with L2TPv2 but it is not strictly backwards compatible. It does have an L2TP '...
KillianDS's user avatar
  • 1,029
5 votes
Accepted

STP frames over VPLS/VPWS

Normally yes, VPLS and VPWS should be transparent to all L2 frames. BPDUs might not be supported by all providers, so you'd want to check the SLA. Alternatively, you should consider routing your ...
Zac67's user avatar
  • 84.4k
4 votes
Accepted

What is the difference between L2VPN and EoMPLS?

You are correct. L2VPN is the technology, and VPLS and VPWS are services configured using that technology. When someone talks about configuring an L2VPN, they could be talking about configuring any of ...
DragonFist616's user avatar
4 votes
Accepted

What exactly does a Juniper PE use to find the correct transport LSP for the L2 circuit(Martini) neighbor?

The neighbor statement implies the remote PE (which should be reachable via MPLS), so in short, inet.3. I'm leaving the config out, but you'd see Remote PE in the output of show l2circuit connections ...
Jordan Head's user avatar
  • 7,099
3 votes
Accepted

MPLS xconnect L2VPN with tagged interface (subinterface) and untagged interface

On the Juniper side, you want to pop the 802.1Q tag on ingress and push upon egress. This way, the frame is untagged while traversing the MPLS core and when it reaches the Cisco. Below is how you ...
Jeff Wheeler's user avatar
  • 5,469
3 votes

Why do we need MPLS when implementing L2/L3 VPNs?

The real strengths of MPLS are that it provides a clear boundary between service and transport and is highly extensible - the fact that you can configure L2 or L3 VPNs across the same IP underlay is ...
Benjamin Dale's user avatar
3 votes
Accepted

VPWS vs X-connect

VPWS and Xconnect is about the same technology. VPWS is the name of technology, xconnect - keyword for configuring pseudowire. You can find different naming like VLL, L2VC, PWE3, etc. Essentially they ...
ar_'s user avatar
  • 1,133
3 votes

Why VPWS service - MPLS has a two ethernet frame headers?

Why there is a need for again source MAC and destination MAC addresses? The original source and destination MAC addresses have no meaning while the packet is in the tunnel. My understanding is ...
Zac67's user avatar
  • 84.4k
2 votes

VPN Networking: How to span a /24 subnet across two locations?

Understanding and Configuring VLAN Routing and Bridging on a Router Using the IRB Feature Background Information In order for a VLAN to span a router, the router must be capable of forwarding frames ...
Ronnie Royston's user avatar
2 votes
Accepted

VPN to a current subnet ID

The point of sale software requires all ipads to be on the same network to function. Generally, that is bad design. Servers and clients should be able to reside in different subnets. If you scatter ...
Zac67's user avatar
  • 84.4k
2 votes
Accepted

L2L ACL issue with Cisco ASA to AWS Cloud

You can't use packet-tracer for outside-to-inside traffic when it comes to tunnels terminated directly on the ASA. Have you actually tested the tunnel both directions with real traffic? Also, you can'...
Jesse P.'s user avatar
  • 4,690
2 votes

Why VPWS service - MPLS has a two ethernet frame headers?

VPWS is a point to point L2VPN, using this technology two geographically remote hosts from the same IP subnet are able to communicate as if they were connected to the same switch. This thing is ...
manish ma's user avatar
  • 1,614
1 vote

Site to Site VPN using GNS3

L2 over WAN/VPN isn't very reliable and potentially creates all sorts of security and liability issues that may get hard to manage when used with networks from other organizations/clients. As ...
Zac67's user avatar
  • 84.4k
1 vote

VPWS vs X-connect

In a nutshell, VPWS or VLL (virtual leased line) support n-to-m connections like Ethernet while Xconnects are point-to-point only.
Zac67's user avatar
  • 84.4k
1 vote

ISP L2vpn setup query

It's kind of strange to differentiate price for the service based on technology rather than SLA. Nevertheless, the best way to find out certainly is to ask your ISP, because there're plenty of ...
ar_'s user avatar
  • 1,133
1 vote

VPN Networking: How to span a /24 subnet across two locations?

a) Can this be done at all? Yes, it can. b) Can we do it in our own gear? (We currently use the Sonicwall NSA 3600, but will migrate off if we need to. What do we need to have, spec wise, in ...
Ron Maupin's user avatar
  • 99.6k

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