Could be an common question: cannot establish EBGP neighbor relationship

libxu · ‎08-28-2012

Hi:

I am stuck on a EBGP configuration. The scnario consists of two VDC on N7K directly connected with a 10G cable. The configuration is as follow:

1) I created VRF A on VDC A, and allocated interface ehternet 9/5 as the VRF A member with IP address 192.168.5.60.

2) On VDC B, I no shut ehternet 9/29, and assigne a IP address 192.168.6.61, the ehternet 9/5 and ehternet 9/29 are directly connected.

3) Next I configured the EBGP on VDCA as

==========================================================================

interface loopback0

ip address 192.168.4.10/24

router bgp 100

router-id 192.168.4.10

address-family ipv4 unicast

redistribute direct route-map permitall

redistribute static route-map permitall

neighbor 192.168.5.61 remote-as 200

address-family ipv4 unicast

vrf B

address-family ipv4 unicast

network 192.168.2.0/24

redistribute direct route-map permitall

redistribute static route-map permitall

neighbor 192.168.5.61 remote-as 200

==========================================================================

4）and EBGP configuration on VDC B is

==========================================================================

interface loopback0

ip address 192.168.6.10/24

router bgp 200

router-id 192.168.6.10

address-family ipv4 unicast

network 192.168.5.0/24

neighbor 192.168.5.60 remote-as 100

address-family ipv4 unicast

==========================================================================

But now the EBGP neighbor relationship is not established, on VDC A,I got debug message like:

==========================================================================

Single hop EBGP peer 192.168.5.61 not directly attached (active), outbound interface Unknown

==========================================================================

Since I didn't use loopback as the peer address, this message seems very weired to me, on the other side, on the VDC B, it showed the BGP instance is trying to establish a peer connection with VDC A, but the timer will expire.

I pinged from the VRF A on VDC A to VDC B, and vise versa, both direction will work.

Really appreciate if anyone point me out which part I am mission. thanks!

Lee Smitherman · ‎08-29-2012

Not had a chance to study this in detail, however have you run the Neighbor xyz activate command in the VRF, its a common mistake i always used to make.

libxu · ‎08-30-2012

Hi, there is no activate command on the NX-OS, but somehow I think you hit the point, I just re-type the "address-family ipv4 unicast" command under the vrf, the EBGP peer automatically established....