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4
Replies

Can't find the problem

fourmoum1
Level 1
Level 1

this is a topology that i'm working on, i'm trying to implement mpls on gns3 but finally i can't ping the destination router, please help me

Sans titre.jpg

my router's configuration :

CE1A, CE1B, CE2A, CE2B, CE3A, CE3B : (same configuration on all custumer routers, only addresses change)

interface Loopback0

ip address 1.1.1.1 255.255.255.255

!

interface Serial0/0

ip address 10.1.1.1 255.255.255.252

serial restart-delay 0

clock rate 64000

!

router rip

version 2

network 1.0.0.0

network 10.0.0.0

no auto-summary

!

ip http server

no ip http secure-server

!

PE1, PE2, PE3 (same configuration on all PEs routers, only addresses change)

!

ip cef

!

!

ip vrf cust_a

rd 100:100

route-target export 100:100

route-target import 100:100

!

ip vrf cust_b

rd 100:200

route-target export 100:200

route-target import 100:200

!

!

interface Loopback0

ip address 172.16.1.1 255.255.255.255

!

interface Serial0/0

ip vrf forwarding cust_b

ip address 10.1.1.2 255.255.255.252

serial restart-delay 0

clock rate 64000

!

interface Serial0/1

ip vrf forwarding cust_a

ip address 10.1.1.2 255.255.255.252

serial restart-delay 0

clock rate 64000

!

interface Serial0/2

no ip address

shutdown

serial restart-delay 0

!

interface Serial0/3

no ip address

shutdown

serial restart-delay 0

!

interface FastEthernet2/0

ip address 192.168.1.1 255.255.255.252

duplex auto

speed auto

mpls label protocol ldp

mpls ip

mpls mtu 1512

!

router ospf 1

log-adjacency-changes

network 172.16.1.1 0.0.0.0 area 0

network 192.168.1.0 0.0.0.3 area 0

!

router rip

!

address-family ipv4 vrf cust_b

  redistribute bgp 1

  network 10.0.0.0

  no auto-summary

  version 2

exit-address-family

!

address-family ipv4 vrf cust_a

  redistribute bgp 1

  network 10.0.0.0

  no auto-summary

  version 2

exit-address-family

!

router bgp 1

no synchronization

bgp log-neighbor-changes

neighbor 172.16.1.2 remote-as 1

neighbor 172.16.1.2 update-source Loopback0

neighbor 172.16.1.3 remote-as 1

neighbor 172.16.1.3 update-source Loopback0

no auto-summary

!

address-family vpnv4

  neighbor 172.16.1.2 activate

  neighbor 172.16.1.2 send-community extended

  neighbor 172.16.1.3 activate

  neighbor 172.16.1.3 send-community extended

exit-address-family

!

address-family ipv4 vrf cust_b

  redistribute rip

  no synchronization

exit-address-family

!

address-family ipv4 vrf cust_a

  redistribute rip

  no synchronization

exit-address-family

!

ip http server

no ip http secure-server

!

!

control-plane

!

P router

ip cef

!

!

interface FastEthernet0/0

ip address 192.168.1.6 255.255.255.252

duplex auto

speed auto

mpls label protocol ldp

mpls ip

mpls mtu 1512

!

interface FastEthernet1/0

ip address 192.168.1.9 255.255.255.252

duplex auto

speed auto

mpls label protocol ldp

mpls ip

mpls mtu 1512

!

interface FastEthernet2/0

ip address 192.168.1.2 255.255.255.252

duplex auto

speed auto

mpls label protocol ldp

mpls ip

mpls mtu 1512

!

interface FastEthernet3/0

no ip address

shutdown

duplex auto

speed auto

!

router ospf 1

log-adjacency-changes

network 192.168.1.0 0.0.0.3 area 0

network 192.168.1.4 0.0.0.3 area 0

network 192.168.1.8 0.0.0.3 area 0

!

ip http server

no ip http secure-server

!

!

!

!

!

!

control-plane

!

!

regards !

2 Accepted Solutions

Accepted Solutions

Mohammed Imran Khan
Cisco Employee
Cisco Employee

Hello Mohamed,

Can you please confirm what you are unable to ping? CE-CE? Is PE-PE pingable (both vrf and LSP)?

If CE-CE is not pinging (but LSP is up and PE-PE vrf routes are pinging) then try this on PE:

router rip

!

address-family ipv4 vrf cust_b

  redistribute bgp 1 >>>>

  network 10.0.0.0

  no auto-summary

  version 2

exit-address-family

Regards,

Imran

View solution in original post

I agree with Imran (+5): Setting a seed-metric for the bgp-to-rip redistribution should fix the problem.

Alternatively you can use the metric transparent option:

PE_2(config-router-af)#redistribute bgp 1

RIP: received v2 update from 10.1.1.1 on Serial0/0

     10.255.2.0/24 via 0.0.0.0 in 16 hops  (inaccessible)

PE_2(config-router-af)#redistribute bgp 1 metric transparent

RIP: sending v2 update to 224.0.0.9 via Loopback1 (10.255.1.1)

RIP: build update entries

        10.255.2.0/24 via 0.0.0.0, metric 1, tag 0

Defining a seed-metric is important when the IGP is RIP or EIGRP.

Regards,

Rolf

View solution in original post

4 Replies 4

Mohammed Imran Khan
Cisco Employee
Cisco Employee

Hello Mohamed,

Can you please confirm what you are unable to ping? CE-CE? Is PE-PE pingable (both vrf and LSP)?

If CE-CE is not pinging (but LSP is up and PE-PE vrf routes are pinging) then try this on PE:

router rip

!

address-family ipv4 vrf cust_b

  redistribute bgp 1 >>>>

  network 10.0.0.0

  no auto-summary

  version 2

exit-address-family

Regards,

Imran

I agree with Imran (+5): Setting a seed-metric for the bgp-to-rip redistribution should fix the problem.

Alternatively you can use the metric transparent option:

PE_2(config-router-af)#redistribute bgp 1

RIP: received v2 update from 10.1.1.1 on Serial0/0

     10.255.2.0/24 via 0.0.0.0 in 16 hops  (inaccessible)

PE_2(config-router-af)#redistribute bgp 1 metric transparent

RIP: sending v2 update to 224.0.0.9 via Loopback1 (10.255.1.1)

RIP: build update entries

        10.255.2.0/24 via 0.0.0.0, metric 1, tag 0

Defining a seed-metric is important when the IGP is RIP or EIGRP.

Regards,

Rolf

fourmoum1
Level 1
Level 1

Thank you Imran and Rolf, it works for me now.

Regards,

Mohamed

Mohammed Imran Khan
Cisco Employee
Cisco Employee

Thanks Rolf! :-)

Mohamed, I am glad issue is resolved now.

Regards,

Imran

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