Help, MPLS/VRF/BGP problem

Discussion in 'Cisco' started by Lars Hansen, Nov 24, 2008.

  1. Lars Hansen

    Lars Hansen Guest

    Hello

    Me and my team mates are having a problem. We are doing our final exam,
    ending 5 years of IT education. An important part of our exam is related to
    networking, and we have run into a problem we hope some of you might be able
    to help us with.

    We have a setup with 4 VRF MPLS Routers, R1, R2, R3 and R4. We use IS-IS as
    our IGP and BGP to distribute VRF. We use VLANs and subinterfaces to
    simulate physical interfaces.

    All routers are working within the same AS called "1337". Alle routers are
    Cisco 28xx series. IOS 12.4

    Our problem is that R4 gives us the following error upon a "debug ip cef
    drops"

    Error - "No Parent Rewrite"

    Nov 24 14:58:10.399: MPLS: Gi0/0.303: recvd: CoS=0, TTL=254, Label(s)=17
    Nov 24 14:58:10.399: ICMP: echo reply sent, src 172.16.2.1, dst 172.16.0.1
    Nov 24 14:58:10.399: mpls_process_pak_setup failed for 172.16.0.1: no parent
    rewrite
    Nov 24 14:58:11.843: les_ip_to_tagswitch: no parent info for 172.16.0.1
    Nov 24 14:58:12.399: MPLS: Gi0/0.303: recvd: CoS=0, TTL=254, Label(s)=17
    Nov 24 14:58:12.399: ICMP: echo reply sent, src 172.16.2.1, dst 172.16.0.1
    Nov 24 14:58:12.399: mpls_process_pak_setup failed for 172.16.0.1: no parent
    rewrite

    The symptom is, that there is no connection (ping) from R1 to R4 in VRF RED,
    but the connection SEEMS to work fine inbetween R1, R2 and R3 in VRF RED.

    R1 -- R3 --- R4

    The configurations are as follows.



    ----------------------------------------R1--------------------------------------------------
    hostname R1
    !
    ip cef
    !
    ip vrf RED
    rd 1337:4
    route-target export 1337:4
    route-target import 1337:4
    !
    interface Loopback0
    ip address 13.37.255.1 255.255.255.255
    !
    interface FastEthernet0/0
    no ip address
    duplex auto
    speed auto
    !
    interface FastEthernet0/0.302
    encapsulation dot1Q 302
    ip address 13.37.2.1 255.255.255.240
    ip router isis
    mpls ip
    !
    interface FastEthernet0/0.340
    encapsulation dot1Q 340
    ip address 13.4.1.2 255.255.255.252
    !
    interface FastEthernet0/0.397
    encapsulation dot1Q 397
    ip vrf forwarding RED
    ip address 172.16.0.1 255.255.255.0
    !
    interface FastEthernet0/0.399
    encapsulation dot1Q 399
    ip address 13.37.99.1 255.255.255.240
    ip router isis
    mpls ip
    !
    router isis
    net 49.0001.0130.3725.5001.00
    is-type level-2-only
    passive-interface Loopback0
    !
    router bgp 1337
    no synchronization
    bgp log-neighbor-changes
    network 13.37.2.0 mask 255.255.255.240
    network 13.37.99.0 mask 255.255.255.240
    network 13.37.255.1 mask 255.255.255.255
    redistribute isis level-2
    neighbor 13.4.1.1 remote-as 404
    neighbor 13.37.255.2 remote-as 1337
    neighbor 13.37.255.2 update-source Loopback0
    neighbor 13.37.255.2 next-hop-self
    neighbor 13.37.255.2 distribute-list 1 out
    neighbor 13.37.255.3 remote-as 1337
    neighbor 13.37.255.3 update-source Loopback0
    neighbor 13.37.255.3 next-hop-self
    neighbor 13.37.255.3 distribute-list 1 out
    no auto-summary
    !
    address-family vpnv4
    neighbor 13.37.255.3 activate
    neighbor 13.37.255.3 send-community both
    exit-address-family
    !
    address-family ipv4 vrf RED
    redistribute connected
    no synchronization
    exit-address-family
    !
    access-list 1 deny 13.37.0.0 0.0.255.255
    access-list 1 permit any
    !


    ----------------------------------------R3--------------------------------------------------

    !
    hostname R3
    !
    ip cef
    !
    ip vrf RED
    rd 1337:4
    route-target export 1337:4
    route-target import 1337:4
    !
    interface Loopback0
    ip address 13.37.255.3 255.255.255.255
    !
    interface GigabitEthernet0/0
    no ip address
    duplex auto
    speed auto
    !
    interface GigabitEthernet0/0.301
    encapsulation dot1Q 301
    ip address 13.37.1.3 255.255.255.240
    ip router isis
    no snmp trap link-status
    mpls ip
    isis circuit-type level-2-only
    !
    interface GigabitEthernet0/0.302
    encapsulation dot1Q 302
    ip address 13.37.2.3 255.255.255.240
    ip router isis
    no snmp trap link-status
    mpls ip
    isis circuit-type level-2-only
    !
    interface GigabitEthernet0/0.303
    encapsulation dot1Q 303
    ip address 13.37.3.3 255.255.255.240
    ip router isis
    no snmp trap link-status
    mpls ip
    isis circuit-type level-1
    !
    interface GigabitEthernet0/0.305
    encapsulation dot1Q 305
    ip vrf forwarding RED
    ip address 172.16.1.1 255.255.255.0
    no snmp trap link-status
    !
    router isis
    net 49.0002.0130.3725.5003.00
    passive-interface Loopback0
    !
    router bgp 1337
    no synchronization
    bgp log-neighbor-changes
    neighbor 13.37.255.1 remote-as 1337
    neighbor 13.37.255.1 update-source Loopback0
    neighbor 13.37.255.1 route-reflector-client
    neighbor 13.37.255.2 remote-as 1337
    neighbor 13.37.255.2 update-source Loopback0
    neighbor 13.37.255.2 route-reflector-client
    neighbor 13.37.255.4 remote-as 1337
    neighbor 13.37.255.4 update-source Loopback0
    neighbor 13.37.255.4 route-reflector-client
    no auto-summary
    !
    address-family vpnv4
    neighbor 13.37.255.1 activate
    neighbor 13.37.255.1 send-community both
    neighbor 13.37.255.1 route-reflector-client
    neighbor 13.37.255.2 activate
    neighbor 13.37.255.2 send-community both
    neighbor 13.37.255.2 route-reflector-client
    neighbor 13.37.255.4 activate
    neighbor 13.37.255.4 send-community both
    neighbor 13.37.255.4 route-reflector-client
    exit-address-family
    !
    address-family ipv4 vrf RED
    redistribute connected
    no auto-summary
    no synchronization
    exit-address-family
    !


    ----------------------------------------R4--------------------------------------------------

    hostname R4
    !
    ip cef
    !
    ip vrf GREEN
    rd 1337:8
    route-target export 1337:8
    route-target import 1337:8
    !
    ip vrf RED
    rd 1337:4
    route-target export 1337:4
    route-target import 1337:4
    !
    interface Loopback0
    ip address 13.37.255.4 255.255.255.255
    !
    interface GigabitEthernet0/0
    no ip address
    duplex auto
    speed auto
    !
    interface GigabitEthernet0/0.303
    encapsulation dot1Q 303
    ip address 13.37.3.4 255.255.255.240
    ip router isis
    mpls ip
    !
    interface GigabitEthernet0/0.307
    encapsulation dot1Q 307
    ip vrf forwarding RED
    ip address 172.16.2.1 255.255.255.0
    !
    interface GigabitEthernet0/0.308
    encapsulation dot1Q 308
    ip vrf forwarding GREEN
    ip address 192.168.2.1 255.255.255.0
    !
    router isis
    net 49.0002.0130.3725.5004.00
    is-type level-1
    passive-interface Loopback0
    !
    router bgp 1337
    no synchronization
    bgp log-neighbor-changes
    neighbor 13.37.255.3 remote-as 1337
    neighbor 13.37.255.3 update-source Loopback0
    no auto-summary
    !
    address-family vpnv4
    neighbor 13.37.255.3 activate
    neighbor 13.37.255.3 send-community both
    exit-address-family
    !
    address-family ipv4 vrf RED
    redistribute connected
    no synchronization
    exit-address-family
    !
    address-family ipv4 vrf GREEN
    redistribute connected
    no synchronization
    exit-address-family
    !
     
    Lars Hansen, Nov 24, 2008
    #1
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