- play_arrow Overview
- play_arrow Understanding MPLS
- play_arrow Supported Standards
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- play_arrow MPLS Configuration
- play_arrow Configuring MPLS
- play_arrow Configuring MPLS Tunnels
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- play_arrow MPLS Traffic
- play_arrow Managing MPLS Traffic
- play_arrow Protecting MPLS Traffic
- play_arrow Measuring MPLS Traffic
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- play_arrow MPLS LSPs
- play_arrow Understanding MPLS LSPs
- play_arrow Configuring MPLS LSPs
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- play_arrow MPLS Signalling Protocols
- play_arrow RSVP
- play_arrow LDP
- LDP Overview
- LDP Configuration
- Example: Configuring Multiple-Instance LDP
- Tunneling LDP over SR-TE
- Example: Tunneling LDP over SR-TE in IS-IS Network
- Example: Tunneling LDP over SR-TE in OSPF Network
- MPLS TTL Propagation Flexibility for LDP-signaled LSPs
- Example: Configuring MPLS TTL Propagation for LDP-signaled LSPs
- Understanding Multipoint LDP Recursive FEC
- Example: Configuring Multipoint LDP Recursive FEC
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- play_arrow MPLS Traffic Engineering
- play_arrow Configuring MPLS Traffic Engineering
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- play_arrow MPLS Transport Profile
- play_arrow Operation, Administration, and Maintenance (OAM) for MPLS
- play_arrow MPLS Pseudowires
- play_arrow Class-of-Service (CoS) for MPLS
- play_arrow Generalized MPLS (GMPLS)
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- play_arrow MPLS for Software Defined Networking (SDN)
- play_arrow Path Computation Element Protocol (PCEP)
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- play_arrow MPLS Troubleshooting
- play_arrow Troubleshooting MPLS
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- play_arrow Configuration Statements and Operational Commands
Understanding Ethernet-over-MPLS (L2 Circuit)
Ethernet-over-MPLS allows sending Layer 2 (L2) Ethernet frames transparently over MPLS. Ethernet-over-MPLS uses a tunneling mechanism for Ethernet traffic through an MPLS-enabled Layer 3 core. It encapsulates Ethernet protocol data units (PDUs) inside MPLS packets and forwards the packets, using label stacking, across the MPLS network This technology has applications in service provider, enterprise and data center environments. For disaster recovery purposes, data centers are hosted in multiple sites that are geographically distant and interconnected using a WAN network.
A Layer 2 circuit is similar to a circuit cross-connect (CCC), except that multiple Layer 2 circuits can be transported over a single label-switched path (LSP) tunnel between two provider edge (PE) routers. In contrast, each CCC requires a dedicated LSP.
Ethernet-over-MPLS in Data Centers
For disaster recovery purposes, data centers are hosted in multiple sites that are geographically distant and interconnected using a WAN network. These data centers require L2 connectivity between them for the following reasons:
To replicate the storage over Fiber Channel IP (FCIP). FCIP works only on the same broadcast domain.
To run a dynamic routing protocol between the sites.
To support High Availability clusters that interconnect the nodes hosted in the various data centers.
