- play_arrow Common Configuration for All VPNs
- play_arrow VPNs Overview
- play_arrow Assigning Routing Instances to VPNs
- play_arrow Distributing Routes in VPNs
- play_arrow Distributing VPN Routes with Target Filtering
- Configuring BGP Route Target Filtering for VPNs
- Example: BGP Route Target Filtering for VPNs
- Example: Configuring BGP Route Target Filtering for VPNs
- Configuring Static Route Target Filtering for VPNs
- Understanding Proxy BGP Route Target Filtering for VPNs
- Example: Configuring Proxy BGP Route Target Filtering for VPNs
- Example: Configuring an Export Policy for BGP Route Target Filtering for VPNs
- Reducing Network Resource Use with Static Route Target Filtering for VPNs
- play_arrow Configuring Forwarding Options for VPNs
- play_arrow Configuring Graceful Restart for VPNs
- play_arrow Configuring Class of Service for VPNs
- play_arrow Pinging VPNs
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- play_arrow Common Configuration for Layer 2 VPNs and VPLS
- play_arrow Overview
- play_arrow Layer 2 VPNs Configuration Overview
- play_arrow Configuring Layer 2 Interfaces
- play_arrow Configuring Path Selection for Layer 2 VPNs and VPLS
- play_arrow Creating Backup Connections with Redundant Pseudowires
- play_arrow Configuring Class of Service for Layer 2 VPNs
- play_arrow Monitoring Layer 2 VPNs
- Configuring BFD for Layer 2 VPN and VPLS
- BFD Support for VCCV for Layer 2 VPNs, Layer 2 Circuits, and VPLS
- Configuring BFD for VCCV for Layer 2 VPNs, Layer 2 Circuits, and VPLS
- Connectivity Fault Management Support for EVPN and Layer 2 VPN Overview
- Configure a MEP to Generate and Respond to CFM Protocol Messages
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- play_arrow Configuring Group VPNs
- play_arrow Configuring Public Key Infrastructure
- play_arrow Configuring Digital Certificate Validation
- play_arrow Configuring a Device for Certificate Chains
- play_arrow Managing Certificate Revocation
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- play_arrow Configuring Layer 2 Circuits
- play_arrow Overview
- play_arrow Layer 2 Circuits Configuration Overview
- play_arrow Configuring Class of Service with Layer 2 Circuits
- play_arrow Configuring Pseudowire Redundancy for Layer 2 Circuits
- play_arrow Configuring Load Balancing for Layer 2 Circuits
- play_arrow Configuring Protection Features for Layer 2 Circuits
- Egress Protection LSPs for Layer 2 Circuits
- Configuring Egress Protection Service Mirroring for BGP Signaled Layer 2 Services
- Example: Configuring an Egress Protection LSP for a Layer 2 Circuit
- Example: Configuring Layer 2 Circuit Protect Interfaces
- Example: Configuring Layer 2 Circuit Switching Protection
- play_arrow Monitoring Layer 2 Circuits with BFD
- play_arrow Troubleshooting Layer 2 Circuits
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- play_arrow Configuring VPWS VPNs
- play_arrow Overview
- play_arrow Configuring VPWS VPNs
- Understanding FEC 129 BGP Autodiscovery for VPWS
- Example: Configuring FEC 129 BGP Autodiscovery for VPWS
- Example: Configuring MPLS Egress Protection Service Mirroring for BGP Signaled Layer 2 Services
- Understanding Multisegment Pseudowire for FEC 129
- Example: Configuring a Multisegment Pseudowire
- Configuring the FAT Flow Label for FEC 128 VPWS Pseudowires for Load-Balancing MPLS Traffic
- Configuring the FAT Flow Label for FEC 129 VPWS Pseudowires for Load-Balancing MPLS Traffic
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- play_arrow Connecting Layer 2 VPNs and Circuits to Other VPNs
- play_arrow Connecting Layer 2 VPNs to Other VPNs
- play_arrow Connecting Layer 2 Circuits to Other VPNs
- Using the Layer 2 Interworking Interface to Interconnect a Layer 2 Circuit to a Layer 2 VPN
- Applications for Interconnecting a Layer 2 Circuit with a Layer 2 Circuit
- Example: Interconnecting a Layer 2 Circuit with a Layer 2 VPN
- Example: Interconnecting a Layer 2 Circuit with a Layer 2 Circuit
- Applications for Interconnecting a Layer 2 Circuit with a Layer 3 VPN
- Example: Interconnecting a Layer 2 Circuit with a Layer 3 VPN
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- play_arrow Configuration Statements and Operational Commands
Understanding Qualified MAC Learning
MAC learning is the process by which a device learns the MAC addresses of all the nodes on a network.
When a node is first connected to an Ethernet LAN or VLAN, it has no information about the other nodes on the network. As data is sent through the network, data packets include a data frame listing their source and destination MAC addresses. The data frame is forwarded to a target port, which is connected to the second device. The MAC address is learned locally at the target port, which facilitates communications for frames that later enter the target port and contain addresses previously learned from a received frame.
During MAC learning, on a ingress packet, the outer tag is implicitly
removed (using the pop operation) and the learning happens
on the inner tag. MAC learning is preceded by VLAN manipulation. VLAN
used for learning can be changed by VLAN push/pop/swap operations.
Qualified MAC learning enables a device to learn the MAC addresses
of network nodes by determining the innermost VLAN tag of single-tagged,
2-tagged , or 3-tagged ingress packets without deleting the outer
tag (using the pop operation). If the ingress packet has
one tag, learning happens on VLAN 4096, and no tags are implicitly
removed. If the ingress packet has two tags, MAC learning happens
on the second VLAN and no tags are implicitly removed. If the ingress
packet has more than three tags, all tags beyond the third tag are
treated as part of data and are not considered for MAC learning.
Qualified MAC Learning on the First, Second, and Third VLAN Tags
For a single-tagged ingress packet, qualified MAC learning happens on VLAN 4096, which is the default VLAN.
In the case of a 2-tagged ingress packet, you enable qualified
MAC learning on the second (inner) tag by using the vlan-id inner-all configuration statement on the VPLS routing instance. Learning on
the second tag happens without the implicit removal of the first (outer)
tag. If the ingress packet has more than two tags, all tags beyond
the second tag are treated as part of data and are not considered
for learning.
Similarly, for an 3-tagged ingress packet, you enable qualified
MAC learning on the third (innermost) tag by configuring the deep-vlan-qualified-learning vlan_tag_number statement on the logical interface along with the vlan-id
inner-all statement on the routing instance. Qualified MAC learning
happens on the third tag, and no VLAN manipulation happens on the
outer tags. However, if deep-vlan-qualified-learning vlan_tag_number is enabled to learn on the third
VLAN and the ingress packet has only two VLANs, the qualified MAC
learning happens on the default VLAN 4096.
Note the following points while configuring qualified MAC learning:
A logical interface contained in a VPLS routing instance configured with
vlan-id inner-allmight or might not havedeep-vlan-qualified-learning vlan_tag_numberconfigured.A logical interface configured with
deep-vlan-qualified-learning vlan_tag_number, must belong to a VPLS routing instance that also hasvlan-id inner-allconfigured.A logical interface configured with
deep-vlan-qualified-learning vlan_tag_number, must also be configured with one outer and one inner tag.
