- 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 Configuring VPLS
- play_arrow Overview
- play_arrow VPLS Configuration Overview
- play_arrow Configuring Signaling Protocols for VPLS
- VPLS Routing and Virtual Ports
- BGP Signaling for VPLS PE Routers Overview
- Control Word for BGP VPLS Overview
- Configuring a Control Word for BGP VPLS
- BGP Route Reflectors for VPLS
- Interoperability Between BGP Signaling and LDP Signaling in VPLS
- Configuring Interoperability Between BGP Signaling and LDP Signaling in VPLS
- Example: VPLS Configuration (BGP Signaling)
- Example: VPLS Configuration (BGP and LDP Interworking)
- play_arrow Assigning Routing Instances to VPLS
- Configuring VPLS Routing Instances
- Configuring a VPLS Routing Instance
- Support of Inner VLAN List and Inner VLAN Range for Qualified BUM Pruning on a Dual-Tagged Interface for a VPLS Routing Instance Overview
- Configuring Qualified BUM Pruning for a Dual-Tagged Interface with Inner VLAN list and InnerVLAN range for a VPLS Routing Instance
- Configuring a Layer 2 Control Protocol Routing Instance
- PE Router Mesh Groups for VPLS Routing Instances
- Configuring VPLS Fast Reroute Priority
- Specifying the VT Interfaces Used by VPLS Routing Instances
- Understanding PIM Snooping for VPLS
- Example: Configuring PIM Snooping for VPLS
- VPLS Label Blocks Operation
- Configuring the Label Block Size for VPLS
- Example: Building a VPLS From Router 1 to Router 3 to Validate Label Blocks
- play_arrow Associating Interfaces with VPLS
- play_arrow Configuring Pseudowires
- Configuring Static Pseudowires for VPLS
- VPLS Path Selection Process for PE Routers
- BGP and VPLS Path Selection for Multihomed PE Routers
- Dynamic Profiles for VPLS Pseudowires
- Use Cases for Dynamic Profiles for VPLS Pseudowires
- Example: Configuring VPLS Pseudowires with Dynamic Profiles—Basic Solutions
- Example: Configuring VPLS Pseudowires with Dynamic Profiles—Complex Solutions
- Configuring the FAT Flow Label for FEC 128 VPLS Pseudowires for Load-Balancing MPLS Traffic
- Configuring the FAT Flow Label for FEC 129 VPLS Pseudowires for Load-Balancing MPLS Traffic
- Example: Configuring H-VPLS BGP-Based and LDP-Based VPLS Interoperation
- Example: Configuring BGP-Based H-VPLS Using Different Mesh Groups for Each Spoke Router
- Example: Configuring LDP-Based H-VPLS Using a Single Mesh Group to Terminate the Layer 2 Circuits
- Example: Configuring H-VPLS With VLANs
- Example: Configuring H-VPLS Without VLANs
- Configure Hot-Standby Pseudowire Redundancy in H-VPLS
- Sample Scenario of H-VPLS on ACX Series Routers for IPTV Services
- play_arrow Configuring Multihoming
- VPLS Multihoming Overview
- Advantages of Using Autodiscovery for VPLS Multihoming
- Example: Configuring FEC 129 BGP Autodiscovery for VPWS
- Example: Configuring BGP Autodiscovery for LDP VPLS
- Example: Configuring BGP Autodiscovery for LDP VPLS with User-Defined Mesh Groups
- VPLS Multihoming Reactions to Network Failures
- Configuring VPLS Multihoming
- Example: VPLS Multihoming, Improved Convergence Time
- Example: Configuring VPLS Multihoming (FEC 129)
- Next-Generation VPLS for Multicast with Multihoming Overview
- Example: Next-Generation VPLS for Multicast with Multihoming
- play_arrow Configuring Point-to-Multipoint LSPs
- play_arrow Configuring Inter-AS VPLS and IRB VPLS
- play_arrow Configuring Load Balancing and Performance
- Configuring VPLS Load Balancing
- Configuring VPLS Load Balancing Based on IP and MPLS Information
- Configuring VPLS Load Balancing on MX Series 5G Universal Routing Platforms
- Example: Configuring Loop Prevention in VPLS Network Due to MAC Moves
- Understanding MAC Pinning
- Configuring MAC Pinning on Access Interfaces for Bridge Domains
- Configuring MAC Pinning on Trunk Interfaces for Bridge Domains
- Configuring MAC Pinning on Access Interfaces for Bridge Domains in a Virtual Switch
- Configuring MAC Pinning on Trunk Interfaces for Bridge Domains in a Virtual Switch
- Configuring MAC Pinning for All Pseudowires of the VPLS Routing Instance (LDP and BGP)
- Configuring MAC Pinning on VPLS CE Interface
- Configuring MAC Pinning for All Pseudowires of the VPLS Site in a BGP-Based VPLS Routing Instance
- Configuring MAC Pinning on All Pseudowires of a Specific Neighbor of LDP-Based VPLS Routing Instance
- Configuring MAC Pinning on Access Interfaces for Logical Systems
- Configuring MAC Pinning on Trunk Interfaces for Logical Systems
- Configuring MAC Pinning on Access Interfaces in Virtual Switches for Logical Systems
- Configuring MAC Pinning on Trunk Interfaces in Virtual Switches for Logical Systems
- Configuring MAC Pinning for All Pseudowires of the VPLS Routing Instance (LDP and BGP) for Logical Systems
- Configuring MAC Pinning on VPLS CE Interface for Logical Systems
- Configuring MAC Pinning for All Pseudowires of the VPLS Site in a BGP-Based VPLS Routing Instance for Logical Systems
- Configuring MAC Pinning on All Pseudowires of a Specific Neighbor of LDP-Based VPLS Routing Instance for Logical Systems
- Example: Prevention of Loops in Bridge Domains by Enabling the MAC Pinnning Feature on Access Interfaces
- Example: Prevention of Loops in Bridge Domains by Enabling the MAC Pinnning Feature on Trunk Interfaces
- Configuring Improved VPLS MAC Address Learning on T4000 Routers with Type 5 FPCs
- Understanding Qualified MAC Learning
- Qualified Learning VPLS Routing Instance Behavior
- Configuring Qualified MAC Learning
- play_arrow Configuring Class of Service and Firewall Filters in VPLS
- play_arrow Monitoring and Tracing VPLS
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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
VPN Graceful Restart
With routing protocols, any service interruption requires that an affected router recalculate adjacencies with neighboring routers, restore routing table entries, and update other protocol-specific information. An unprotected restart of the router results in forwarding delays, route flapping, wait times stemming from protocol reconvergence, and even dropped packets. Graceful restart allows a routing device undergoing a restart to inform its adjacent neighbors and peers of its condition. During a graceful restart, the restarting device and its neighbors continue forwarding packets without disrupting network performance.
For VPN graceful restart to function properly, the following items need to be configured on the PE router:
BGP graceful restart must be active on the PE-to-PE sessions carrying any service-signaling data in the session’s network layer reachability information (NLRI).
OSPF, IS-IS, LDP, and RSVP graceful restart must be active, because routes added by these protocols are used to resolve VPN NLRIs.
For other protocols (static, Routing Information Protocol [RIP], and so on), graceful restart functionality must also be active when these protocols are run between the PE and CE routers. Layer 2 VPNs do not rely on this, because protocols are not configured between the PE and CE routers.
In VPN graceful restart, a restarting router completes the following procedures:
Waits for all the BGP NLRI information from other PE routers before it starts advertising routes to its CE routers.
Waits for all protocols in all routing instances to converge (or finish graceful restart) before sending CE router information to the other PE routers.
Waits for all routing instance information (whether it is local configuration or advertisements from a remote peer router) to be processed before sending it to the other PE routers.
Preserves all forwarding state information in the MPLS routing tables until new labels and transit routes are allocated and then advertises them to other PE routers (and CE routers in carrier-of-carriers VPNs).
Graceful restart is supported on Layer 2 VPNs, Layer 3 VPNs, and virtual-router routing instances.
Benefit of a VPN graceful restart
The main benefit of a VPN graceful restart is that it allows a router whose VPN control plane is undergoing a restart to continue to forward traffic while recovering its state from neighboring routers. It temporarily suppresses all routing protocol updates and enables a router to pass through intermediate convergence states that are hidden from the rest of the network. Without graceful restart, a control plane restart disrupts the VPN services provided by the router.
