Computer and IT knowledge - things to know
KNX IP devices - with aruba os switches
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>> for communication the multicast default address is 224.0.23.12 !
>> it is very important that igmp is configured, and on of the switches has the igmp querier role !
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The IP routing multicast address defines the destination address for the IP messages of KNX IP devices.
The default address 224.0.23.12 is the address for KNXnet/IP devices set by the KNX Association in conjunction with IANA.
This address should be maintained and only changed if the existing network requires the use of a different address.
By default, these messages are sent as multicast messages to the multicast IP address 224.0.23.12, port 3671.
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Configuration on Arubo OS switch side
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- own vlan, for example vlan 100 name knx
- configure all knx ip devices to be in vlan 100 (untagged)
- enable igmp on the switch and the vlan!
(1) set ip lookup mode, to be able to use igmp version 3
>> igmp lookup-mode ip
(2)
>enable igmp in the vlan, and assign for example port 1 to 5 on the switch, also give the switch an ip address so that the igmp network can have a querier!
>> vlan 100
name "knx"
untagged 1-5
ip address 10.24.100.50 255.255.255.0
ip igmp
ip igmp version 3
exit
- igmp show commands
(1)
show ip igmp groups
IGMP Group Address Information
VLAN ID Group Address Expires UpTime Last Reporter | Type
------- --------------- ------------- ------------- --------------- + ------
100 224.0.23.12 0h 4m 14s 0h 28m 31s 10.24.100.20 | Filter
100 224.22.4.224 0h 4m 17s 0h 28m 32s 10.196.69.10 | Filter
(2)
show ip igmp
> here you should see the Querier Address
- how to see the igmp messages? debugging on switch
>> debug ip igmp
>> debug destination session
>> to turn off, say: no debug ip igmp
you should see messages like this:
0008:18:05:26.57 IGMP mIpPktRecv: Received an IGMP v3 membership report; VID:100
port:1 src:10.24.100.20 dest:224.0.23.12
example KNX ip device: ABB i-bus® KNX IP-Router IPR/S 3.1.1 Produkthandbuch
-- https://new.abb.com/products/de/2CDG110175R0011/ipr-s3-1-1
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