Riverbed SteelHead 3070-SD, User Manual

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92 | Configuring High Availability on SteelHead SD
Overview of HA on SteelHead SD
SteelHead SD also supports asymmetric HA deployments.
Figure 10-2. Asymmetric HA deployment
SteelHead SD includes these HA features:
• Symmetric and asymmetric connectivity.
• Layer 2 (L2) and Layer 3 (L3) LAN topologies.
• OSPF and BGP where SteelHead SD can peer with a router.
• Backup standby HA link for LAN port if the AUX port is unreachable.
• Master role under Appliances > Appliances Overview: HA tab.
• Mixed-mode HA, where one SteelHead SD appliance is licensed for SD-WAN-only mode and the
peer SteelHead SD appliance is licensed for SD-WAN and WAN optimization modes.
• Dedicated HA link for the SteelHead SD HA pair so that the peer appliances operate as a single
logical unit.
• Autoconfiguration of the HA partner for bootstrapping when SCM connectivity with a peer is not
accessible.
• Integration with SCM health check for visibility and troubleshooting.
• Zscaler support for HA deployments.
Symmetric and asymmetric uplink connectivity
SteelHead SD provides symmetric and asymmetric uplink connectivity:
• Symmetric - In symmetric mode, each peer appliance is connected to all uplinks so that they
essentially act as a single appliance. For example, you can have the 2 WAN uplinks connected to the
peer appliances with four uplinks. Each uplink operates as a separate tunnel with separate IP
addresses assigned to each uplink. If there is an uplink failure, the tunnel on that uplink goes down
and the traffic is moved to the backup appliance. The 3070-SD supports up to 6 uplinks, where you
can have 1 internet and 2 MPLS WAN uplinks for a total of 6 uplinks.