SAP EP+HACMP (HA configuration)

I have a following configuration:

Node1 (global host): SCS11, JC10, DB

Node2 (standby host): J13

Installation on a global host carried out with the following option:

#./sapinst SAPINST_USE_HOSTNAME=sapnode

sapnode - virtual hostname, which differs from system hostname and has ip-label in /etc/hosts file.

Standby host has been installed with other option, because with "sapnode" option don't starting J13.

#./sapinst SAPINST_USE_HOSTNAME=standby

But there was a problem that if JC10 has been switched off, and J13 is started, the portal was inaccessible.

In what there can be a reason? What additional options are necessary?

Than installation "distributed" from "HA" differs?

SW: SAP NW 7.0 sr2.

It can be necessary additional components in HA architecture, for example web dispatcher?