Technical data

DATA CENTER and CAMPUS NETWORKS DEPLOYMENT GUIDE
Deploying Brocade Networks with Microsoft Lync Server 2010 26 of 52
Table 5. Ports Required, Load Balancer VIP Used by Enterprise Edition Front End Servers
Port Required
Port Use
5060
Client-to-server SIP communication over TCP
5061
Client-to-Front End Server SIP communication over TLS
SIP communication between Front End Servers over MTLS
5063 (TCP)
Used for incoming SIP listening requests for audio-visual (A/V) conferencing
5069 (TCP)
Used for Monitoring Server
135
To move users and perform other pool-level WMI operations over DCOM
Having no failover makes configuration and management somewhat easier, because you do not have to configure
and manage specific appliances. However, if one server fails, then your entire Unified Communications environment
is down, which means you have no VoIP, no IM, no presence, and/or no conferencing. Failover allows another
hardware load balancer to continually provide access to the servers in case of a failure. The different methods of
deploying a hardware load balancer are as follows:
• Active-Hot Standby. One active hardware load balancer, with another hardware load balancer in
standby (supported only with switch code).
• Active-Standby VIP. Both hardware load balancer switches can receive traffic, but only the Active VIP
handles the Layer 4–7 traffic. The other VIP is in standby mode and functions as a standby (supported
with router or switch code).
• Active-Active. Both hardware load balancer switches are active for the same VIP, and the hardware
load balancer that receives the request is the one that services that request. In the case of a hardware
load balancer failure, the remaining hardware load balancer handles all requests (supported with
router or switch code).
Setting Up Active-Hot Standby Redundancy
In a typical hot standby configuration, one Brocade hardware load balancer is the active device and performs all the
Layer 2 switching as well as the Layer 4 server load balancing, while the other hardware load balancer monitors the
switching activities and remains in a hot standby role.
If the active hardware load balancer becomes unavailable, the standby hardware load balancer immediately
assumes the responsibilities of the unavailable hardware load balancer switch. The failover from the unavailable
hardware load balancer to the standby hardware load balancer happens transparently to users. Both hardware load
balancer switches share a common MAC address, which is known to the clients. Therefore, if a failover occurs, the
clients still know the hardware load balancer by the same MAC address. The active sessions that are running on the
clients continue, and the clients and routers do not need to re-ARP (Address Resolution Protocol) for the hardware
load balancer MAC address.
NOTE: All real servers must be connected to the Brocade ServerIron switches via a Layer 2 switch or NIC team
directly to the hardware load balancer switches (with the active NIC connected to the active hardware load balancer).
• To configure port 1 on each hardware load balancer, enter the following command:
Hardware load balance (config)# server backup Ethernet 1 00e0.1234.1234 vlan-id 999
(This is the same primary MAC address used on both hardware load balancer switches.)