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W
Wan_Whisperer
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February 24th, 2025 20:05
Dell 4048 running OS9 using Static VXLAN need help with Multicast so HSRP on Routers will work
I was able to get Static VXLAN working between two Dell 4048 on OS9 but I now need to be able to push multicast over it. Specifically Hello packets from my routers using HSRP.
So all routers need to exchange HSRP hello packets from site 1 and site 2. 
RTR-1
RTR-2
RTR-3
RTR-4
host SW-1
feature vxlan
!
vxlan-instance 1 static
local-vtep-ip 101.101.101.1
no shutdown
vni-profile VNI_Profile
vnid 100
remote-vtep-ip 102.102.102.2 vni-profile VNI_Profile
exit
interface TenGigabitEthernet 1/48
description to_SW-2
ip address 100.100.100.1/24
mtu 9216
no negotiation auto
no shutdown
interface TenGigabitEthernet 1/16
description to_Computer-1
vxlan-instance 1
no ip address
switchport
no shutdown
interface Vlan 50
vxlan-vnid 100
no ip address
untagged TenGigabitEthernet 1/16
no shutdown
interface Loopback 1
ip address 101.101.101.1/24
no shutdown
ip route 0.0.0.0/0 TenGigabitEthernet 1/48
host SW-2
feature vxlan
!
vxlan-instance 1 static
local-vtep-ip 102.102.102.2
no shutdown
vni-profile VNI_Profile
vnid 100
remote-vtep-ip 101.101.101.1 vni-profile VNI_Profile
exit
interface TenGigabitEthernet 1/48
description to_SW-1
ip address 100.100.100.2/24
mtu 9216
no negotiation auto
no shutdown
interface TenGigabitEthernet 1/16
description to_Computer-1
vxlan-instance 1
no ip address
switchport
no shutdown
interface Vlan 50
vxlan-vnid 100
no ip address
untagged TenGigabitEthernet 1/16
no shutdown
interface Loopback 1
ip address 102.102.102.2/24
no shutdown
ip route 0.0.0.0/0 TenGigabitEthernet 1/48
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Posted February 25th, 2025 13:21
@DELL-Joey C Thanks for your input. I will update the post once I have it working.
-WW
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Posted February 26th, 2025 01:08
* Try using /32 for loopbacks (101.101.101.1/32 and 102.102.102.2/32)
* Add the gateway IP to the static default routes (or enable OSPF on those interfaces):
ip route 0.0.0.0/0 TenGigabitEthernet 1/48 100.100.100.2 (SW1)
ip route 0.0.0.0/0 TenGigabitEthernet 1/48 100.100.100.1 (SW2)
HSRP (or VRRP) packets are standard Ethernet BUM traffic, they do not need any IP multicast support0
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Posted February 26th, 2025 12:24
@jbemmel Thanks for the reply but HSRP hello packets are sent to multicast address 224.0.0.2 with UDP port 1985. Maybe I am misunderstand? Can you please explain?
https://www.cisco.com/c/en/us/support/docs/ip/hot-standby-router-protocol-hsrp/9281-3.html
-WW
DELL-Joey C
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Posted February 25th, 2025 07:57
Hi,
My networking engineer friend is not around for me to consult about the configuration, I'm unsure if you need VRRP for this configuration. But from your configuration above, I would think you need multicast-routing, PIM and igmp snooping enabled.
Reference: https://dell.to/4kgSqyg
But for configuration advice, I would advise contacting the support for the configuration commands and verification for your enviroment, in case there is any misconfig.
DELL-Joey C
Social Media and Communities Professional
Dell Technologies | Enterprise Support Services
#IWork4Dell
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