HP 600 Series, Services And Applications

Page: 182 / 316

1. Node A wants to connect to node B, checks the Nodal Registry, and
does not have an entry for node B. It sends out a Probe name request.
2. The name request from node A is bridged by the routers to node B.
3. Node B replies to the name request.
4. The name reply (containing the IP address) is bridged back to node
A.
5. Node A then sends a VNA request using node B’s IP address.
6. The local router knows a route to node B’s network, so it responds to
node A’s VNA with the router’s station address.
7. node A transmits a TCP sync packet to node B’s IP address to the
router’s station address.
8. The local router routes the TCP sync packet to the destination
network.
9. The remote router receives the TCP synchronous packet for node B.
If node B is not in the ARP cache, it sends a VNA request (and ARP, if
it is enabled) for node B’s station address.
10. Node B replies to the router with a VNA with its station address.
11. The remote router sends the TCP sync packet to node B’s station
address.
12. When node B wants to reply to the TCP sync packet with a TCP ack
sync packet, it must get the return station address, so it sends a VNA
request.
13. The remote router responds to the VNA request with its station
address.
14. Node B sends a TCP ack sync packet to node A’s IP address to the
station address of the remote router.
15. The remote router routes the TCP ack sync packet to the local router.
A Primer on HP Probe
Connection Scenarios
2-130