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8 Link Backup
This chapter mainly contains the following contents:
SLA
Track
VRRP
Interface Backup
8.1 SLA
1. Basic Concepts and Principles
Under normal circumstances, the edge router can detect if the link linked to the ISP is in fault. If the
network linking to one ISP is in fault, another ISP will be used to transmit all the data streams.
However, if the link of an ISP is normal and the infrastructure fails, the edge router will continue to
use this route. Then, the data is no longer reachable.
One feasible solution is to using static routing or policy-based routing to first test the reachability of
important destination. If it is unreachable, the static routing will be deleted.
The reachability test can be performed with InHand SLA to continuously check the reachability of
ISP and be associated with static routing.
Basic principles of InHand SLA: 1.Object track: Track the reachability of the specified object. 2.
SLA probe: The object track function can use InHand SLA to send different types of detections to
the object. 3. Policy-based routing using route mapping table: It associates the track results with the
routing process. 4. Using static routing and track options.
2. SLA Configuration Steps
Step 1: Define one or more SLA operations (detection).
Step 2: Define one or more track objects to track the status of SLA operation.
Step 3: Define measures associated with track objects.
8.1.1 SLA Status
Page Wizard: Link Backup → SLA
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