08-20-2018 03:53 AM - edited 08-20-2018 03:53 AM
I'm very new to BGP and have been using GNS3 to help me understand how to configure BGP on Cisco IOS. See below what my test network looks like and I've attached the configs from the 3 devices.
I'm seeing the 3 VLAN's on the LAN Core in the Gateway and CPE01 routing tables. I can ping the 3 VLAN interfaces from the Gateway device but not on the CPE01, when I do a trace route from the CPE01 device to the VLAN interfaces first hop is Gateway VLAN 600 address and then it fails.
Any help would be much appreciated?
Solved! Go to Solution.
08-20-2018 07:56 AM
Hello,
The configs are correct. Which devices are you using in GNS3 ?
08-20-2018 03:56 AM
I don't see the configs (sh run) attached...
08-20-2018 04:12 AM
LAN Core
interface Loopback0
no ip address
!
interface Ethernet0/0
no switchport
ip address 10.170.94.2 255.255.255.252
duplex auto
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
--More-- !
interface Ethernet1/0
!
interface Ethernet1/1
!
interface Ethernet1/2
!
interface Ethernet1/3
!
interface Ethernet2/0
!
interface Ethernet2/1
!
interface Ethernet2/2
!
interface Ethernet2/3
!
interface Ethernet3/0
!
interface Ethernet3/1
switchport access vlan 103
!
interface Ethernet3/2
--More-- switchport access vlan 102
!
interface Ethernet3/3
switchport access vlan 101
!
interface Vlan1
no ip address
shutdown
!
interface Vlan101
ip address 10.170.0.1 255.255.252.0
!
interface Vlan102
ip address 10.170.4.1 255.255.252.0
!
interface Vlan103
ip address 10.170.8.1 255.255.252.0
!
router bgp 100
bgp log-neighbor-changes
network 10.170.0.0 mask 255.255.252.0
network 10.170.4.0 mask 255.255.252.0
network 10.170.8.0 mask 255.255.252.0
--More-- neighbor 10.170.94.1 remote-as 100
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
Gateway
interface Ethernet0/0
no switchport
ip address 10.170.94.1 255.255.255.252
duplex auto
!
interface Ethernet0/1
!
interface Ethernet0/2
switchport access vlan 600
!
interface Ethernet0/3
switchport access vlan 600
!
--More-- interface Ethernet1/0
!
interface Ethernet1/1
!
interface Ethernet1/2
!
interface Ethernet1/3
!
interface Ethernet2/0
!
interface Ethernet2/1
!
interface Ethernet2/2
!
interface Ethernet2/3
!
interface Ethernet3/0
!
interface Ethernet3/1
!
interface Ethernet3/2
!
interface Ethernet3/3
--More-- !
interface Vlan1
no ip address
shutdown
!
interface Vlan600
ip address 10.170.39.1 255.255.255.240
!
router bgp 100
bgp log-neighbor-changes
neighbor 10.170.39.9 remote-as 65057
neighbor 10.170.94.2 remote-as 100
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
CPE01
interface Ethernet0/0
!
interface Ethernet0/1
!
interface Ethernet0/2
no switchport
ip address 10.170.39.9 255.255.255.240
duplex auto
!
interface Ethernet0/3
!
interface Ethernet1/0
!
--More-- interface Ethernet1/1
!
interface Ethernet1/2
!
interface Ethernet1/3
!
interface Ethernet2/0
!
interface Ethernet2/1
!
interface Ethernet2/2
!
interface Ethernet2/3
!
interface Ethernet3/0
!
interface Ethernet3/1
!
interface Ethernet3/2
!
interface Ethernet3/3
!
interface Vlan1
--More-- no ip address
shutdown
!
router bgp 65057
bgp log-neighbor-changes
neighbor 10.170.39.1 remote-as 100
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
08-20-2018 05:00 AM
Hello,
your LAN Core router does not have a route back to CPE01. You can add a static route on the LAN Core router:
ip route 0.0.0.0 0.0.0.0 10.170.94.1
Also, configure the neighbors in AS100 with next hop self:
LAN Core
neighbor 10.170.94.1 remote-as 100
neighbor 10.170.94.1 next-hop-self
Gateway
neighbor 10.170.94.2 remote-as 100
neighbor 10.170.94.2 next-hop-self
08-20-2018 05:59 AM
Thanks for the info, I added what you recommended below but I still can't ping from CPE01 to any address on LAN Core
08-20-2018 06:28 AM
Hello,
post your running configs again with the changes...you might have misconfigured something...
08-20-2018 06:56 AM
08-20-2018 07:56 AM
Hello,
The configs are correct. Which devices are you using in GNS3 ?
08-20-2018 11:59 PM
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