ZXR10 8900E supports FRR for static routing, OSPF, IS-IS, and RIP, which easily
implements traffic switching of single-directional traffic to meet the switching time
requirement.
3.7.7.2 LDP FRR
LDP FRR is MPLS-related reliability technology. With the help of LDP label distributing
protocol, it distributes active/standby labels for routes. Saving the standby label, it quickly
respond to route change, switch label to the standby label, and implement 50ms
switching protection in case of network failure. Label standby equals to standby LSP.
When a certain link or node on the protected LSP fails, label can be quickly switched to
the standby link as shown in Figure 3-24. R2 directs e2/2 to back up e2/1 port. In this way
LSP will has two next-hops. One is on the active link specified by the routing protocol.
The other is standby. When port 2/1 is detected to fail, label will be quickly switched to
e2/2. When the route recovers, label will be switched back to e2/1 port.
Figure 3-24 Label switching diagram
LDP FRR is only a temporary protection measure. When the protected link recovers,
traffic will be switched back to the original LSP. LDP FRR doesn’t need to rely on
complicated MPLS TE. Standby LSP for link, node or route doesn’t need to be set up
respectively. It’s easy to implement with the spreading of MPLS.
3.7.7.3 MPLS TE FRR
MPLS TE FRR is a set of link protection and node protection mechanism in MPLS TE.
When LSP link or node fails, protection is implemented at the node where failure occurs.
In this way traffic can be permitted to go through via the tunnel of protected link or node
so that data transmission will not be interrupted. At the same time head node can go on
initiating recreation of active route with data transmission not influenced.
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