IP Setup for BGP

[Michael_Goodlif]

Hi, I am preparing new IPs I have received for BGP and am wondering if my configuration is correct.

I have a single /22 IPv4 which i have split into four separate /24's.

For the example this will be x.x.160.0/22
so the /24's are:
x.x.160.0/24
x.x.161.0/24
x.x.162.0/24
x.x.163.0/24

I am going to be peering using a BGP session connected over the vlan Default which already has IP's routed to it from our datacentre.

I have created four loopback VLAN's for the four /24's:

---------------------------------------------------------------------------------------Name VID Protocol Addr Flags Proto Ports Virtual
Active router
/Total
---------------------------------------------------------------------------------------
Default 1 x.x.x.x /26 -f---------T----------- ANY 11/18 VR-Default

vlan_LB 4089 x.x.160.1 /24 -fL-------------------- ANY 0 /0 VR-Default
vlan_LB2 4087 x.x.161.1 /24 -fL-------------------- ANY 0 /0 VR-Default
vlan_LB3 4086 x.x.162.1 /24 -fL-------------------- ANY 0 /0 VR-Default
vlan_LB4 4085 x.x.163.1 /24 -fL-------------------- ANY 0 /0 VR-Default

as you can see, ipforwarding is enabled on all VLAN's.

show iproute:
Ori Destination Gateway Mtr Flags VLAN Duration
#d x.x.x.x/26 x.x.x.x 1 U------um--f Default 0d:1h:40m:16s
#d x.x.160.0/24 x.x.160.1 1 U------um--f vlan_LB 0d:0h:22m:8s
#d x.x.161.0/24 x.x.161.1 1 U------um--f vlan_LB2 0d:1h:25m:1s
#d x.x.162.0/24 x.x.162.1 1 U------um--f vlan_LB3 0d:1h:24m:9s
#d x.x.163.0/24 x.x.163.1 1 U------um--f vlan_LB4 0d:1h:23m:56s

I have servers currently connected to the Default VLAN and will be intending to use these new IP's on these servers.

I have set the IPs on one of the servers to x.x.160.100 with the gateway x.x.160.1 which is the vlan_LB gateway IP. However the gateway is unreachable and cannot be pinged:

[root@localhost ~]# ping 185.53.160.1
PING 185.53.160.1 (185.53.160.1) 56(84) bytes of data.

--- 185.53.160.1 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1830ms

Is my configuration correct to add the gateway's to separate VLAN's?

I did a test and added the gateway x.x.160.1 IP as a secondary IP to the Default VLAN and I can ping the gateway x.x.160.1 from the test server.

Should I be adding the gateway's as IP's on their own loopback VLAN's, or add them as secondary IP's on the Default VLAN where they are going to be used?

for BGP I will use the below to peer:

configure bgp routerid x.x.160.2
configure bgp add network x.x.160.0/24
configure bgp add network x.x.161.0/24
configure bgp add network x.x.162.0/24
configure bgp add network x.x.163.0/24

Thanks.

[Sumit_Tokle]

In order to ping any vlan, you should have active port present in that vlan. If you don't want to add a port in vlan and at the same time want to activate the vlan then you have to enable the loopback mode on that vlan.

Command to enable the loopback mode is: "enable loopback-mode vlan vlan_name"

[Michael_Goodlif]

Thanks. I would prefer to keep it in a separate VLAN for easier management and maintenance.

Could you please explain to me how I would make the gateway accessible from the Default VLAN if it was on it's own VLAN with no ports, like I have above?

[Jarek]

Yes, you should add it as secondary (if you need so).

But you can also add it in separate vlan, then you would have a smaller broadcast domain.

--
Jarek

[Michael_Goodlif]

Hi Jarek, thanks for the reply. The servers using these new IP's will be plugged into ports on the Default VLAN, so should I just configure these new gateway's on the Default VLAN as secondary IP's?

[Jarek]

Hi,

you don't have any port in vlan vlan_LB:

vlan_LB 4089 x.x.160.1 /24 -fL-------------------- ANY 0 /0 <--- VR-Default

You must add a port which is connected to this server, for example:
configure "Default" delete ports 1
configure vlan_LB add ports 1 untagged

--
Jarek