Configuring Dynamic Bfd For Ipv4 Is-Is - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
<HUAWEI> display isis interface verbose
Interface
GE1/0/0
Description
SNPA Address
IP Address
IPV6 Link Local Address
IPV6 Global Address(es)
Csnp Timer Value
Hello Timer Value
DIS Hello Timer Value
Hello Multiplier Value
LSP-Throttle Timer
Cost
Ipv6 Cost
Priority
Retransmit Timer Value
Bandwidth-Value
Static Bfd
Dynamic Bfd

7.9 Configuring Dynamic BFD for IPv4 IS-IS

Dynamic BFD for IPv4 IS-IS can accelerate IS-IS route convergence.
Context
Connection status between an IS-IS device and its neighbors can be monitored by exchanging
Hello packets at intervals. The minimum allowable sending interval is 3s, and a neighbor is
declared Down after at least three intervals during which no response Hello packet is received
from the neighbor. IS-IS takes more than one second to detect that a neighbor becomes Down,
resulting in loss of a large amount of high-speed data.
To solve this problem, BFD must be configured for IS-IS. BFD provides millisecond-level fault
detection. After detecting a link or node failure, BFD will notify IS-IS of the failure, accelerating
the IS-IS route convergence speed.
Dynamic BFD for IPv4 IS-IS implements dynamic setup of BFD sessions. When a new IS-IS
neighbor relationship is set up, BFD is notified of the neighbor parameters and the detection
parameters (including source and destination IP addresses). Then a BFD session will be
established based on the received neighbor parameters. Dynamic BFD is more flexible than
static BFD.
Pre-configuration Tasks
Before configuring dynamic BFD for IPv4 IS-IS, complete the following tasks:
l
Configuration Roadmap
The configuration roadmap is as follows:
Issue 02 (2014-09-30)
Interface information for ISIS(1)
---------------------------------
Id
001
Configuring Basic IPv4 IS-IS
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
IPV4.State IPV6.State
Up
: GigabitEthernet1/0/0 Interface
: 00e0-c72d-da01
: 123.1.1.1
:
:
: L1 10 L2
: L1 10 L2
: L1 3 L2
: L1 3 L2
: L12 50
: L1 20 L2
: L1 20 L2
: L1 64 L2
: L12 5
: Low 100000000
: YES
: NO
Functions.
7 IS-IS Configuration
MTU Type
Down 1497 L1/L2 No/No
10
10
3
3
20
20
64
High 0
DIS
559