#Gns3 asa activeactive failover how to#
#Gns3 asa activeactive failover software#
#Gns3 asa activeactive failover mac#

#Gns3 asa activeactive failover mac#

When the failed unit comes back online, it stays in a standby state and takes over the standby IP addresses and MAC addresses. When a failover occurs, the standby unit assumes the IP addresses and MAC addresses of the failed unit (formerly active) and begins passing traffic.

The active unit always uses the primary unit's IP and MAC addresses. When a failover occurs, the new active unit takes over the active IP addresses and MAC addresses. When you configure ASA's interfaces, you can optionally specify a standby IP address alongside the active IP address on the same subnet. MAC Addresses and IP Addresses Standby IP Address You can use a different switch or connect the failover link directly between the units as shown below. Recommended - Cisco recommends that failover links not use the same switch as the data interfaces. Not recommended - If a single switch or a set of switches is used to connect both failover and data interfaces between two ASAs, then when a switch or inter-switch-link is down, both ASAs become active (split-brain) as shown below. Subsequently, the failover operation is suspended until the health of the failover link is restored. For example, If the failover link is down, the ASA can use the data interfaces to determine if a failover is necessary. Failover Link DesignĬisco recommends that the failover links and data interfaces use different paths in order to decrease the chance of all interfaces failing at the same time. You can use a dedicated data interface (physical or Port-Channel) as the state link.Ĭisco recommends the latency for the stateful failover link should be less than 10 milliseconds and no more than 250 milliseconds.

Stateful Failover Link - To use Stateful Failover, you must configure a Stateful Failover link to exchange 'connection state' information.

Configuration replication and synchronization.

Failover Link - The two units in a failover pair constantly communicate over the failover link to determine the operating status of each unit.

For example, for a failover link, if you have used Gi0/1 in device 1, use the same interface Gi0/1 in device 2 as well. Cisco recommends using the same interface between the two firewalls. With the ASAs, you need two links - the failover link and the optional stateful failover link. Failover and Stateful Failover LinksĪs with any other firewall cluster, you need to have some sort of connectivity between the firewalls to exchange information such as heart-beat and state information. The two firewalls in a failover configuration do not need to have identical licenses the licenses combine to make a failover cluster license.

#Gns3 asa activeactive failover software#

Both units should have the same major (first number) and minor (second number) software version.

Have the same modules installed and have the same RAM installed.

Both units in a Failover must be the same model and have the same number and types of interfaces.

When a failover occurs, it occurs at the failover group level. One group is assigned to be Active on the primary ASA, and the other group is assigned to be active on the Secondary ASA. A failover group is simply a logical group of one or more security contexts. In Active/Active failover, you divide the security contexts on the ASA into 2 failover groups. Please note that Active/Active failover is only available to ASAs in multiple context modes. In an Active/Active failover, both ASAs can pass traffic. When a failover occurs, the Standby unit assumes the active role and starts passing the traffic. The second standby unit does not actively pass traffic. In Active/Standby failover, one device functions as the Active unit and passes the traffic. ASA Fail-Over ModesĪs I mentioned before, ASA supports two failover modes, Active/Active failover and Active/Standby failover.

#Gns3 asa activeactive failover how to#

In this blog post, we will learn how to configure Active/Passive Failover on the Cisco ASA firewalls. You can also choose an Active/Active design if that suits your environment. Most of us would usually go with an Active/Passive firewall design where the Active firewall processes the traffic and the Standby firewall just sits there and waits to take over in an event of a failure. When it comes to firewalls, we only have very limited options because of the stateful nature of the firewall appliances. In terms of routers or switches, we have a variety of options to choose from such as Switch-Stack, vPC, VSS, HSRP etc.

High Availability is one of the most crucial requirements for a smooth network operation.