ComWare DHCP Option 43 with HP E-MSM WLAN Solutions
Four discovery methods are available. The following table summarizes their
features and recommended applications.
If controlled APs are behind a firewall or NAT device.
Discovery is performed whenever an AP:
Is restarted (or reset to factory defaults)
Loses connectivity with its controller
Is removed and rediscovered using an action on the Controlled APs >>
Overview > Discovered APs page.
Unprovisioned APs
Once an unprovisioned AP has received its IP address from a DHCP server, it
attempts to discover a controller using the following methods, in order:
UDP broadcast
DHCP
DNS
When configured as DHCP client (which is the factory default setting for all APs),
an AP can obtain the IP addresses of controllers on the network from any DHCP
server configured to support the Colubris Vendor Class (DHCP option 43).
Note: If you have two (2) or more E-MSM Controllers, the AP will only connect to
one (1) controller at a time based on the priority listing. In the event that the EMSM
AP loses its connectivity to the active controller, discovery process is
performed again.
Green=1000Mbps, Yellow =10/100Mbps
SYS
RPS
SLOT1
SFP+
49 50 51 52
Green=10Gbps, Yellow=1Gbps
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
10/100/1000Base-T
Duplex: Green=Full Duplex, Yellow=Half Duplex PoE: Green=Delivering Power, Yellow=Fault, Flashing Gren=Over Budget
H3C S5800 Series
Mode
Green=Speed
Yellow=Duplex
Unit
Flashing=PoE
1. These are the assumptions that we will be using in our
config example using two (2) E-MSM Controllers.
E-MSM Controller #1 192.168.1.12 (hex C0A8 010C)
E-MSM Controller #2 192.168.1.13 (hex C0A8 010D)
Subnet – 192.168.5.0/255.255.255.0
Domain Name – cinci.rr.com
DNS servers – 209.18.47.62
Gateway – 192.168.5.1
#
dhcp enable
#
dhcp server ip-pool 192.168.5.0-net
network 192.168.5.0 mask 255.255.255.0
gateway-list 192.168.5.1
dns-list 209.18.47.62
domain-name cinci.rr.com
option 43 hex 0108 C0A8010C C0A8010D
Notes:
01 - Colubris option code 1 as defined in the DHCP server
08 - Option code 1 is 8 bytes long which are the IP addresses of the controller in
hex C0A8010C & C0A80CD
2. These are the assumptions that we will be using in our
config example using two (3) E-MSM Controllers.
E-MSM Controller #1 192.168.1.12 (hex C0A8 010C)
E-MSM Controller #2 192.168.1.13 (hex C0A8 010D)
E-MSM Controller #2 192.168.1.14 (hex C0A8 010E)
Subnet – 192.168.5.0/255.255.255.0
Domain Name – cinci.rr.com
DNS servers – 209.18.47.62
Gateway – 192.168.5.1
#
dhcp enable
#
dhcp server ip-pool 192.168.5.0-net
network 192.168.5.0 mask 255.255.255.0
gateway-list 192.168.5.1
dns-list 209.18.47.62
domain-name cinci.rr.com
option 43 hex 010C C0A8010C C0A8010D C0A8010E
Notes:
01 - Colubris option code 1 as defined in the DHCP server
0C - Option code 1 is 12 bytes long which are the IP addresses of the controller
in hex C0A8010C, C0A8010D & C0A8010E
The MSM controller can handle up to five (5) IP addresses for IP
provisioning.
If there is a DNS Server lists defined on the DHCP IP pool, the AP(S) will try to
connect first via DNS before sending unicast packets to each individual controller
sent via DHCP. The AP appends the default domain name returned by a DHCP
server (when it assigns an IP address to the AP) to the controller name.
cnsrv1.<domain-name>
cnsrv2.<domain-name>
cnsrv3.<domain-name>
cnsrv4.<domain-name>
cnsrv5.<domain-name>
