What is DHCP failover clustering?
“ – [Narrator] DHCP Failover uses two nodes in a cluster with DHCP installed on both of them, and that can make our DHCP role highly available in case one of the nodes in the cluster fails. It can also be used for load bouncing.
What is the disadvantage of DHCP failover cluster?
Unfortunately, there are a few drawbacks with DHCP: DHCP can become a single point of failure for your network. If you only have one DHCP server and it’s not available, clients won’t be able to request or renew leases.
How DHCP failover clustering is configured?
Steps to configure DHCP failover Install the DHCP Server role on this device. Next, return to the original DHCP server, right-click the scope you wish to configure for failover and select Configure Failover. The wizard walks you through the remaining settings. The DHCP service must also be running on both systems.
Which ports are required for DHCP failover?
DNS/DHCP Server ports used as a client:
| Port Number | Protocol | Use |
|---|---|---|
| 647 | TCP | DHCP failover |
| 694 | UDP | xHA (heartbeat) |
| 847 | TCP/UDP | DHCP failover |
| 7788 | TCP | xHA disk partition data replication |
What supports DHCP resilience?
DHCP failover provides redundancy and load balancing for DHCP services, enabling administrators to deploy a highly resilient DHCP service. With DHCP failover, Internet Protocol version 4 (IPv4) scopes with associated leases, reservations, options, and settings, are shared by two Windows DHCP servers.
What is the use of DHCP failover?
The DHCP failover protocol provides a method for two DHCP servers to communicate with each other. Depending on the configuration, DHCP failover can provide both redundancy and load balancing by sharing one or more pools between two or more DHCP servers. The servers are known as failover peers.
What are the benefits provided by DHCP snooping?
DHCP snooping can prevent DHCP spoofing attacks. DHCP snooping is a Cisco Catalyst feature that determines which switch ports can respond to DHCP requests. Ports are identified as trusted and untrusted. Only ports that connect to an authorized DHCP server are trusted, and allowed to send all types of DHCP messages.
On which port does DHCP failover listen for failover traffic?
TCP port 647
DHCP failover uses TCP port 647 to listen for failover messages between two failover partner servers.