config b/n PE to CE

• create vrf & apply to interfaces
• create ip vrf by command
•  ip vrf A  in global mode
• Route Distinguishers
• goal is to make the prefix unique in entire mpls network
• formate of RD changed based on service provider
• AS followed by locally significant number
• router-id followed by locally significant number
•  rd config
• rd 200:1  /** config under ip vrf A
• rd 200:2
• apply vrfs to interfaces 
• int e0/0
•    ip vrf forwarding A
•    ip address 1.1.1.1 255.255.255.0    /** reenter ip add because enabling of vrf on interface remove the ip add of the interface
• sh ip route    /*** global routing table shows the separate tables for the each customer
• sh route | in interface | in ip address
• under the igp process enable seperate address family
• router eigrp    /**under given igp route process
•   address-family ipv4 vrf A
• sh ip vrf detail
• sh ip route vrf *    /** sh all vrf routing tables
• address-family ip v4 vrf / vpv4

MPLS configuration

• MPLS also called Dynamic Label Switching
• Before configuring first enable the CEF
• command used is ip cef in global mode
• Verify by show command show ip cef
• It increases the packet switching speed.
• main
• Enable MPLS forwarding of ipv4 packets along the routed paths( also called Dynamic Label Switching
• must be enable on interface & device
• command: mpls ip
• 
  
• unique router-id important in MPLS
• As a router-id loopback address is more advantage than interface address 
• command used to router-id as loopback is
• mpls ldp router-id loopback0 force
• In sometimes loopback ip address used as router-id cannot be reachable
• at that time an interface is used as router-id, to this use the following command under interface
•  mpls ldp discovery transport-address interface
• enable mpls on routing protocol enabled interfaces
• mpls ldp autoconfig under routing process.
• enable mpls authentication globally.
• mpls ldp password required  in global mode
• mpls ldp neighbour 150.1.5.55 password CISCO
• to show mpls neighbours
• show mpls ldp neighbors
• to show mpls enabled interfaces
• show mpls interfaces
• to show mpls authentication
• show mpls ldp neighbor password
• to show LFIB table
• show mpls forwarding-table
• to check the packets are forwarding by MPLS
• traceroute 150.1.5.5
• normally LDP will generate & adverties labels for every prefix found in the local routing table
• to avoid this & enable only on some prefixes uses the access control list
• exampls:

                                access-list 10 permit 150.1.0.0 0.0.255.255

                                 no mpls ldp advertise-labels

                                 mpls ldp advertise-labels for 10

• PE configuration
• in mpls network full mesh of PEs was created using ibgp peerings
• for example

router bgp 100

    neighbor 155.1.5.5 remote-as 1oopback0

    neighbor 155.1.5.5 update-source loopback0

    address-family vpv4 unicast         /** activating vpv4 address family

    neighbor 150.1.5.5 activate 

    neighbor 150.1.5.5 send-community extended

   neighbor 150.1.5.5 route-reflector-client

•   to define VRF use command
• ip vrf vrf-name
•