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 !