Category archives: Cisco l2vpn xconnect configuration examples

As I mentioned briefly last time, a pseudowire is simply an emulated circuit. By using L2TPv3, it is possible to extend a number of layer-2 circuit types over an IP backbone network. Enterprises use pseudowires to extend layer-2 circuits over their IP networks. Before diving into the configuration of L2TPv pseudowires, it's a good idea to take a quick look at how they work.

I'll start by taking a look at the two types of L2TPv3 messages: control connection messages and data channel messages. Control connection messages can be used by the LCCEs to setup the control connection itself, to establish L2TPv3 sessions, to indicate circuit status changes, to tear down sessions, to terminate the control connection, and to provide a keepalive mechanism.

Data channel messages, on the other hand, are the messages that actually carry the Layer-2 protocols and connections over the IP backbone.

cisco l2vpn xconnect configuration examples

PE' as an example here. The configuration of an L2TPv3 pseudowire with dynamic session establishment can be broken down into five steps:. The five steps must be configured on both endpoints both LCCEs. PE' is shown below:. CEF is enabled by default, so the ip cef command, which is used to enable CEF, is not explicitly shown above. But if it is disabled, make sure that you enable it, otherwise L2TPv3 pseudowires will not function. The address on this interface is the address from which and to which L2TPv3 packets will be sent.

It's a very good idea to use a loopback interface for this purpose as they do not go down unlike physical interfaces. PE' otherwise the L2TPv3 pseudowire will not function. Next is the L2TPv3 class, which is configured using the l2tp-class name command.

cisco l2vpn xconnect configuration examples

An L2TPv3 class is optional, but recommended because it allows you configure a number of control channel parameters such as authentication. PE' to the L2TPv3 pseudowire. Here are the latest Insider stories. More Insider Sign Out. Sign In Register. Sign Out Sign In Register. Latest Insider. Check out the latest Insider stories here. More from the IDG Network. L2TPv3 Pseudowhat?The document will help provide a quick reference on the configuration and verification aspect of the VXLAN Xconnect feature.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration. If your network is live, make sure that you understand the potential impact of any command. As of writing this document, Q-in-VNI feature is only supported within flood and learn vxlan deployments. Xconnect feature is introduced as a replacement for the q-in-vni feature on Nexus platforms.

The support for q-in-vni may be added in future releases. Downstream switches are Nexus 3ks which are configured with SVIs in respective vlans to mimic the hosts.

Note : STP has to be disabled within the xconnect vlan. MAC learning will not be happening within xconnect vlan which essentially means there is no Type 2 bgp l2vpn evpn updates for MAC addresses Due to this, traffic from one vtep will be encapsulated with the outer destination IP Address set to the Mcast-group The dot1q tunnel interfaces will be stuck in error disabled state in an xconnect vxlan setup if the configurations within vPC switches are not consistent.

Below are some of the cases wherein the interface will be in error disabled. It is recommended to use unique multicast group for the xconnect vlans. Multicast traffic might hit both the vPC boxes on the remote side of xconnect; However, Decap winner the box which can decapsulate the BUM will be only one switch in a vPC pair.

If the Flag shown here is a lower case vit means the box is decap loser and if its an Upper case Vthe box is the decap winner and so can decapsulate the multicast traffic and forward it further down. Skip to content Skip to footer. Available Languages. Download Options. Updated: December 13, Contents Introduction. Introduction The document will help provide a quick reference on the configuration and verification aspect of the VXLAN Xconnect feature.

Overview As of writing this document, Q-in-VNI feature is only supported within flood and learn vxlan deployments. VTEP1 sh run int nve1 no shutdown host-reachability protocol bgp source-interface loopback1 member vni mcast-group Heartbeat messages that land on vPC secondary will be sync'd to the primary 2. Contributed by Cisco Engineers Varun Jose.

Was this Document Helpful? Yes No Feedback. Related Cisco Community Discussions.We have it configured, and the status show UP UP, but the customer is having problems pinging across this link - is there an issue in the configuration or are there other commands I could use to figure out the problem with this circuit? Buy or Renew. Find A Community. We're here for you! Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for. Search instead for. Did you mean:. Julie Tupling. MPLS l2 xconnect configuration. Labels: MPLS. I have this problem too. Latest Contents. Created by smilstea on PM. Some basic examples of traffic engineering are used but the concepts lend the Created by gosekar on AM. Created by pallu on PM. Make sure that you have console access to the router. Verify that the system is running a minimum o BGP Flowspec implementation on Cisco platforms.

IntroductionWhile gNMI is fairly new, it's becoming more and more powerful.We have it configured, and the status show UP UP, but the customer is having problems pinging across this link - is there an issue in the configuration or are there other commands I could use to figure out the problem with this circuit? Buy or Renew. Find A Community. We're here for you! Turn on suggestions.

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MPLS Layer 2 VPNs Configuration Guide

Did you mean:. Julie Tupling. MPLS l2 xconnect configuration. Labels: MPLS. I have this problem too. Latest Contents. Created by smilstea on PM. Some basic examples of traffic engineering are used but the concepts lend the Created by gosekar on AM.

Created by pallu on PM. Make sure that you have console access to the router. Verify that the system is running a minimum o BGP Flowspec implementation on Cisco platforms.

Introduction:

IntroductionWhile gNMI is fairly new, it's becoming more and more powerful. Its abilities to simplify network management by the use of protocol buffer files and standard definitions are enabling our customers to integrate a lot better in multi-vendor enviYour software release may not support all the features documented in this module.

For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.

MPLS Layer 2 VPNs Configuration Guide

An account on Cisco. The feature blindly passes the sequencing data through the xconnect packet paths, a process that is called transparent sequencing. The endpoint PE-CE connections enforce the sequencing. Instead, configure interworking on the routers at the edge PEs of the network. The control word negotiation results must match.

If either segment does not negotiate the control word, the control word is disabled for both segments. AToM Graceful Restart is negotiated independently on each pseudowire segment.

Per-pseudowire quality of service QoS is not supported. Traffic Engineering TE tunnel selection is supported.

cisco l2vpn xconnect configuration examples

L2VPN Pseudowire Switching connects two or more contiguous pseudowire segments to form an end-to-end multihop pseudowire.

This end-to-end pseudowire functions as a single point-to-point pseudowire. The ASBRs join the pseudowires of the two domains. L2VPN Pseudowire Switching also enables you to keep different administrative or provisioning domains to manage the end-to-end service.

At the boundaries of these networks, PE-agg routers delineate the management responsibilities. The following list explains exceptions:. The outgoing virtual circuit VC label replaces the incoming VC label in the packet. Sequence numbers are not validated. In this configuration, you are limited to two neighbor commands after entering the l2 vfi command.We have two routers, R1 and R2.

Now we can focus on the L2TPv3 configuration. First, we create a new pseudowire class. This is the template for the tunnel where we set the source interface and encapsulation type:. Now we need to bind the pseudowire to the interface where we want to bridge our L2 traffic. This is done with the xconnect command. This completes our configuration. This gives a quick overview that shows our virtual circuit ID and the interface that the pseudowire is connected to.

This gives us some interesting output. You can also see the protocol number here The show xconnect command is a bit similar to the first command. It is a nice quick way to see if the pseudowire is up though:. What does this L2TPv3 encapsulated traffic look like in Wireshark? Explained As Simple As Possible.

Full Access to our Lessons. More Lessons Added Every Week! Yes, it may be necessary in some implementations to tune the MTU for the operation of the tunnel. My apologies for not responding to this one, it seems to have fallen through the cracks. Once again, I am sorry, but thank you for sharing your findings and your thoughts. They are useful to all of us!

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MPLS L2 VPN with Xconnect and Pseudowire Template with Wireshark

You may cancel your monthly membership at any time. No Questions Asked! Next Lesson Introduction to Metro Ethernet. Forum Replies Hi Chris, This is no problem. Hello Max Yes, it may be necessary in some implementations to tune the MTU for the operation of the tunnel. Hello Hussein My apologies for not responding to this one, it seems to have fallen through the cracks. We use cookies to give you the best personal experience on our website.

By using our website, you agree to our use of cookies Read more.Interworking is a transforming function that is required to interconnect two heterogeneous attachment circuits ACs. Several types of interworking functions exist. The function that is used would depend on the type of ACs being used, the type of data being carried, and the level of functionality required.

An interworking function facilitates the translation between different L2 encapsulations. Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.

An account on Cisco. This section lists general restrictions that apply to L2VPN interworking. Other restrictions that are platform-specific or device-specific are listed in the following sections.

The interworking type on one provider edge PE router must match the interworking type on the peer PE router. Security access control list ACL and other features based on IP header fields parsing are not supported.

There must be a one-to-one relationship between an AC and the pseudowire. Point-to-multipoint or multipoint-to-point configurations are not supported. You must configure routing protocols for point-to-point operation on the CE routers when configuring an Ethernet to non-Ethernet setup. In the IP interworking mode, the IPv4 translation is supported. Everything else is dropped. Otherwise, you might experience traffic drops. There must be a one-to-one relationship between a PPP session and the pseudowire.

Multiplexing of multiple PPP sessions over the pseudowire is not supported. Only IP IPv4 interworking is supported.

The ATM encapsulation type supported for bridged interworking is aal5snap. However, ATM encapsulation types supported for routed interworking are aal5snap and aal5mux.


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