Answer / muthiah nagarajan

When you create a routing group, the first server in that
routing group is assigned the role of routing group master.

The routing group master keeps track of the link state
information and propagates it to the other servers in the
routing group, and other servers communicate back any
changes in link state.

For example, if a member server tries to contact another
server over a connector, and this link is unavailable, the
member server immediately notifies the routing group
master.
Likewise, when a non-master receives new link state
information, it immediately transfers the link state
information to the master, so that other servers can
receive the information about the routing change

Answer / mukesh singh, isource

When you create a routing group, the first server in that
routing group is assigned the role of routing group master.
The routing group master maintains current link state
information for its routing group and propagates it to the
other servers within the routing group. The routing group
master monitors the routing configuration that is written in
Active Directory for its routing group only. Member servers
can communicate any connector state or server availability
information to the routing group master. For example, if a
member server tries to contact another server in a different
routing group over a connector, and this link is
unavailable, the member server immediately notifies the
routing group master. Likewise, when a non-master server
receives new link state information, it immediately
transfers the connector state information to the routing
group master, so that other servers can receive the
information about the routing change.
When you designate a routing group master, ensure that the
server you choose has good access to a domain controller
because this is where it reads the configuration information
that is stored in Active Directory. Additionally, when a
change occurs in the configuration of its routing group,
Exchange System Manager writes this information directly to
Active Directory and then the domain controller notifies the
routing group master of this change. The routing group
master then propagates this information to all the member
servers.
Within a routing group, the routing group master and the
other Exchange servers communicate link state information
over TCP/IP port 691. However, communication of link state
information between routing groups is different. If the
routing group master is not a bridgehead server for the
routing group, the routing group master sends the link state
information to the group's bridgehead server over TCP/IP
port 691. The bridgehead server then forwards this
information (over TCP/IP port 25 using SMTP and the
X-LINK2STATE verb) to the bridgehead servers of other
routing groups.

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