iBGP+ peership on CLIP between two switches with IPv6 Tunneling

The following figure shows a sample network that contains iBGP+ peers using IPv6 tunneling.

iBGP+ peers on CLIP interfaces with IPv6 tunneling

You must enable OSPF on the interface and globally as well.

If you cannot enable OSPF, you must configure static routes to provide reachability to the BGP+ peer.

The static route must point to the next hop for the routes to be installed in the IPv6 RTM.

The next hop must be the BGP peer IP address.

The IPv4 interfaces do not need to connect directly, but the routing table on each switch must include the IPv4 interface of the other switch.

iBGP between the CLIP interfaces needs to run OSPF as a routing protocol so that the BGP neighbor can remain reachable.

eBGP connections cannot use a CLIP interface as an end point.

R1 configuration

interface GigabitEthernet 3/2
brouter port 3/2 vlan 2090 subnet 192.0.2.1/255.255.255.0 mac-offset
2
exit
#  OSPF CONFIGURATION - GlobalRouter
#

router ospf enable

# OSPF PORT CONFIGURATION
#

interface gigabitethernet 3/2
ip ospf enable
exit

# CIRCUITLESS IP INTERFACE CONFIGURATION - GlobalRouter
#

interface loopback 1
ip address 1 1.1.1.1/255.255.255.255
ip ospf 1

# BGP CONFIGURATION - GlobalRouter
#

router bgp
no synchronization
exit
router bgp as-dot enable
router bgp 65000 enable
router bgp
neighbor "2.2.2.2"
neighbor 2.2.2.2 remote-as 65000
neighbor 2.2.2.2 next-hop-self
neighbor 2.2.2.2 update-source 1.1.1.1
neighbor 2.2.2.2 address-family ipv6
neighbor 2.2.2.2 enable
exit
# IPV6 CONFIGURATION
#

ipv6 forwarding

# IPV6 TUNNEL CONFIGURATION
#

ipv6 tunnel 10 source 192.0.2.1 address 2001:DB8::/32 destination
192.0.2.2

#
# IPV6 STATIC ROUTE CONFIGURATION
#

ipv6 route 0:0:0:0:0:ffff:2.2.2.2/128 cost 1 tunnel 10
#

R2 configuration

interface GigabitEthernet 4/32
brouter port 4/32 vlan 2090 subnet 192.0.2.2/255.255.255.0 mac-offset
2
exit
#  OSPF CONFIGURATION - GlobalRouter
#

router ospf enable

# OSPF PORT CONFIGURATION
#

interface gigabitethernet 4/32
ip ospf enable
exit

# CIRCUITLESS IP INTERFACE CONFIGURATION - GlobalRouter
#

interface loopback 1
ip address 1 2.2.2.2/255.255.255.255
ip ospf 1

# BGP CONFIGURATION - GlobalRouter
#

router bgp
no synchronization
exit
router bgp as-dot enable
router bgp 65000 enable
router bgp
neighbor "1.1.1.1"
neighbor 1.1.1.1 remote-as 65000
neighbor 1.1.1.1 next-hop-self
neighbor 1.1.1.1 update-source 2.2.2.2
neighbor 1.1.1.1 address-family ipv6
neighbor 1.1.1.1 enable
exit
# IPV6 CONFIGURATION
#

ipv6 forwarding

# IPV6 TUNNEL CONFIGURATION
#

ipv6 tunnel 10 source 192.0.2.2 address 2001:DB8::/32 destination
192.0.2.1

#
# IPV6 STATIC ROUTE CONFIGURATION
#

ipv6 route 0:0:0:0:0:ffff:1.1.1.1/128 cost 1 tunnel 10
#