VXLAN L2 Extension Configuration question

thaizoun — Wed, 15 Dec 2021 00:02:00 GMT

Greetings,

I am tasked by my manager to configure VXLAN in our lab using BROCADE VDX6740 and ICX 7750 .We have a couple of VM clients connected to each of these Brocade devices .I have OSPF configured as an IGP to provide the underlay transport connectivity and i can reach the loopback interfaces of the VXLAN tunnel endpoints.

The VXLAN configuration on the ICX requires that the vlans to be mapped to a vni must not have a VE interfaces in the running config .

ICX7750-1(config-overlay-gw-VXLAN_TO_VDX6740)#map vlan 10 to vni 1001
error - virtual router interface configured on L2 vlan

So i removed the ve interface i had with an ip which servers as the default gateway to the client A . After that i configured the L2 VXLAN Extension on the ICX 7750 as follows :

overlay-gateway VXLAN_TO_VDX6740
type layer2-extension
ip interface loopback 1
map vlan 10 to vni 1001
site SITE-A
ip address 10.20.1.1
extend vlan add 10

ICX7750-1#show overlay-gateway

Overlay Gateway Name : VXLAN_TO_VDX6740
Type : layer2-extension
Source IP Interface : loopback 1 (vrf: default-vrf, IP address: 10.10.1.1)
Total Mapped Vlans : 1
Total Sites : 1

Total 1 Overlay Gateways

CX7750-1#sh overlay-gateway VXLAN_TO_VDX6740 detail

Overlay Gateway Name : VXLAN_TO_VDX6740
Type : layer2-extension
Source IP Interface : loopback 1 (vrf: default-vrf, IP address: 10.10.1.1)
Total Mapped Vlans : 1
Total Sites : 1
# VLAN-ID VN-ID VFI Access-Port Extended-Site
- ------- ----- --- ----------- -------------
1 10 1001 10 1 1
# SiteName IP-Address Status Ext-Vlans
- -------- ---------- ------ ---------
1 SITE-A 10.20.1.1 Up (10)
ICX7750-1#

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

VXLAN Config on the VDX6740

overlay-gateway VXLAN_TO_ICX7750
type layer2-extension
ip interface loopback 1
attach rbridge-id add 1
map vlan 10 vni 1001
site SITE-B
ip address 10.10.1.1
extend vlan add 10
activate

rb1# ping 10.10.1.1
Type Control-c to abort
PING 10.10.1.1 (10.10.1.1): 56 data bytes
64 bytes from 10.10.1.1: icmp_seq=0 ttl=58 time=1.238 ms
64 bytes from 10.10.1.1: icmp_seq=1 ttl=58 time=1.093 ms
64 bytes from 10.10.1.1: icmp_seq=2 ttl=58 time=1.077 ms
64 bytes from 10.10.1.1: icmp_seq=3 ttl=58 time=1.213 ms

rb1# show vlan 10
VLAN Name State Ports Classification
(F)-FCoE (u)-Untagged
(R)-RSPAN (c)-Converged
(T)-TRANSPARENT (t)-Tagged
================ =============== ========================== =============== ====================
10 VLAN0010 ACTIVE Te 4/2/7(u)
Te 1/0/1(t)
Te 1/0/17(u)
Tu 61441(t) vni 1001

rb1# show tunnel brief
Number of tunnels: 1

Tunnel 61441, mode VXLAN, rbridge-ids 1
Admin state up, Oper state down
Source IP 10.20.1.1, Vrf default-vrf
Destination IP 10.10.1.1

The tunnel operation is down on the VDX6740.

I tried generating some icmp traffic from one client towards the other , to see if this will trigger the tunnel to change to operational , but it did not work and the pings fail .

I am suspecting the issue might be that client A cannot ping its default gateway ( ICX7750 ) since i had to remove the int ve ip address for vlan 10 on the ICX to avoid the error i was getting when i was configuring vxlan.

The VDX 6740 can ping the client B and it servers as its DG .

Yet, if this is just a L2 extension , no default Gateway is needed since both clients belong to the same subnet/broadcast domain.

i successfully configured L2 extension VXLAN on Arista devices within GNS3 ans was able to ping b/w the clients without setting a default gateway on the clients since they do not need it to communicate locally on the same subnet

Please advise if you had ran through the same issue .

planning to configure VXLAN using BGP EVPN after i get this one working .

Thank you in advance

Talal

topic VXLAN L2 Extension Configuration question in Data Center (VDX)

VXLAN L2 Extension Configuration question