13
Configuring static route FRR
A link or router failure on a path can cause packet loss and even routing loop. Static route fast reroute
(FRR) enables fast rerouting to minimize the impact of link or node failures.
Figure 1 Network diagram
, upon a link failure, packets are directed to the backup next hop to avoid traffic
interruption. You can either specify a backup next hop for FRR or enable FRR to automatically select
a backup next hop (which must be configured in advance).
Configuration guidelines
•
Do not use static route FRR and BFD (for a static route) at the same time.
•
Static route does not take effect when the backup output interface is unavailable.
•
Equal-cost routes do not support static route FRR.
•
The backup output interface and next hop must be different from the primary output interface
and next hop.
•
To change the backup output interface or next hop, you must first remove the current setting.
•
Static route FRR is available only when the state of primary link (with Layer 3 interfaces staying
up) changes from bidirectional to unidirectional or down.
Configuring static route FRR by specifying a backup next hop
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Configure static route
FRR.
•
Method 1:
ip route-static
dest-address
{
mask-length
|
mask
}
interface-type
interface-number
[
next-hop-address
[
backup-interface
interface-type
interface-number
[
backup-nexthop
backup-nexthop-address
] ] ]
[
permanent
] [
preference
preference
]
[
tag
tag-value
] [
description
text
]
•
Method 2:
ip route-static vpn-instance
s-vpn-instance-name
dest-address
{
mask-length
|
mask
}
interface-type
interface-number
[
next-hop-address
[
backup-interface
interface-type
interface-number
[
backup-nexthop
backup-nexthop-address
] ] ]
[
permanent
] [
preference
preference
]
[
tag
tag-value
] [
description
text
]
By default, static route FRR
is disabled.
Router A
Router B
Router E
Backup nexthop: Router C
Nexthop: Router D
Содержание HPE FlexNetwork 7500 series
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