BROCADE IP PRIMER

Chapter 12: Multi Protocol Label Switching (MPLS)Now, to add MPLS to the network, enter the following:BR-Switch(config)# router MPLSBR-Switch(config)# mpls-interface (intf number)BR-Switch(config-interface #/#)# ldp-enableBR-Switch(config)# write memoryOnly the interfaces for the Provider and Provider Edge are given the ldp-enablecommand. Do not enable MPLS or LDP on any Provider Edge to Customer Edgelinks.To validate the configuration for MPLS, enter the following:BR-Switch# show mpls ldp neighborAll MPLS neighbor relationships should be shown and connected.BR-Switch# show mpls ldp session detailThis command should provide complete details on the MPLS LDP connections,indicating if the path is established with its corresponding IP address.BR-Switch# show mpls ldp pathThis command should provide details on the LDP paths created in the MPLSlabel forwarding table.If the steps are completed correctly, basic MPLS is up and running.MPLS Virtual Leased Lines (VLL)What is VLL? VLL is also known as Pseudo Wire Emulation (PWE). MPLS VLL isa method of providing point-to-point Ethernet /VLAN connectivity over an MPLSdomain. The VLL is considered to be a Layer 2 VPN circuit across a single Layer3 backbone.How Virtual Leased Lines workPackets from the Customer edge device A are routed to the Provider Edge LER.The LER assigns the packet to a RSVP-signaled LSP whose endpoint is the destinationLER that is connected to the customer edge device B. The destinationLER is known as the VLL Peer for the LER connected to Customer device A.The RSVP-signaled LSP used to reach the VLL-peer is known as the tunnel LSP.For the packet to arrive at the other LER, two labels are used, the inner VClabel and the outer tunnel label. The inner VC label is used for determiningwhat happens to the packet once it reaches its VLL peer. The outer label isused for forwarding the packet through the MPLS domain. Note that the LDPtunnel is unidirectional and will require VLL peers to be built in both directions.If Class of Service is set for the VLL, the Brocade device selects a tunnel LSPthat also has this CoS value. If no tunnel LSP with this CoS value is availablethen the Brocade device selects a tunnel LSP with the highest CoS value.264 Brocade IP Primer