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VXC clients INI and Image fileserver or VXCM discovery

VXC clients INI and Image fileserver or VXCM discovery detail steps.

1. VXC Powered UP

2. VXC Sent DHCP Discovery, and received DHCP OFFER and DHCP ACK

3. If DHCP option 161(File server URL)  is found, VXC initiates connection to the file server with the URL and  protocol specified by option 161, and port number specified by option  162

4. If DHCP option 186(VXCM IP address) is found, VXC initiate connection to VXCM with the IP address specified by option 186

5. If only DHCP option 194(VXCM FQDN) is found, VXC will use DNS query

6. VXC query DNS for SRV record: _WDMServer._tcp.domain.com for VXCM ip address and port number

7. VXC query DNS CNAME record: WDMServer.domain.com for VXCM ip address, and assume port 80 as default

8. VXC query DNS A record: WDMServer.domain.com for VXCM ip address, and assume port 80 as default

9. VXC query DNS A record for DHCP option 194 string value as VXCM FQDN, and port 80 is assumed

10. VXC initiate connection to VXCM IP address resolved by the DNS queries


Note: TheadX type of  device (VXC 2x11) required step 6 and SRV record must be configured.  WTOS type of device (VXC 2x12) rely on DHCP option tags or local  administrative configuration for discovering VXCM name or ip address, so  step 5 - step 9 are not applicable to WTOS clients


Wireshark capture scenario 1(6215) using DHCP 186:

DHCP configuration:

ip dhcp pool jezhouvlan715
    network 192.168.15.0 255.255.255.0
    default-router 192.168.15.1
    option 150 ip 10.67.82.15
    dns-server 192.168.15.10
    domain-name vxi.cisco.com
    option 186 ip 192.168.15.15



  
Wireshark capture scenario 2(6215) using DNS:

DHCP configuration:

ip dhcp pool jezhouvlan715
    network 192.168.15.0 255.255.255.0
    default-router 192.168.15.1
    option 150 ip 10.67.82.15
    dns-server 192.168.15.10
    domain-name vxi.cisco.com
    option 194 ascii vxcm-vxi.vxi.cisco.com

Version history
Revision #:
1 of 1
Last update:
‎01-17-2013 09:44 PM
Updated by:
 
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