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Huawei BFD configuration specification
2022-07-06 05:52:00 【Creator of high-quality network system】
BFD Configuration specifications for
BFD for LSP The round-trip path of the session message needs to be consistent to ensure LSP Normal path switching
To configure BFD for LSP During session detection , From source device to destination device LSP Path and return LSP perhaps IP The path is inconsistent . Return trip LSP perhaps IP When the path fails , BFD conversation Down , Lead to LSP Path MIS cut
in .
Application scenarios
Pictured Shown , RouterA And RouterB There are two paths between , route 1 And the path 2 .
BFD for LSP Inconsistent round-trip paths of session messages lead to LSP Network diagram of path error switching
NE Router -BFD Configuration specifications for -4812357-1
Configuration specification
Deploy on the network BFD for LSP During session detection :
dynamic BFD for LSP conversation , Consider configuring routing constraints , Ensure that the back and forth paths are consistent , For example, use high priority static routing .
static state BFD for LSP conversation ( barring BFD for TE-LSP), Consider configuring routing constraints , Ensure that the back and forth paths are consistent , For example, use high priority static routing .
static state BFD for TE-LSP conversation , Through strict explicit path constraints LSP Back and forth path , And the diameter of the incoming circuit is configured BFD for TE-LSP Type session , Ensure that the back and forth paths are consistent .
The risk of non-standard configuration
Risk description
Configuration dynamics BFD for LSP Session detection , The way to go 1 by LSP route , Return path 2 by IP route .
Configure static BFD for LSP conversation ( barring BFD for TE-LSP), Return path 2 by LSP route , And with the RouterA To RouterB Of LSP Paths do not share paths .
route 1 And the path 2 All configured BFD for TE-LSP conversation ,RouterA and RouterB Of course TE-LSP There is no strict explicit path configured .
When any of the above conditions is met ,BFD The outgoing and return paths of the session are inconsistent , When the return path fails , It may lead to the journey LSP Wrong path switching .
The business phenomenon is as follows :
BFD The conversation is intended to detect the path 1, But when the path 2 When it breaks down , because BFD The return path is blocked , conversation Down, Trigger path 1 Upper LSP Switch to the fault path by mistake 2 On , This leads to the loss of business traffic .
Risk judgment method
Let's take a dynamic BFD The process of conversation is LSP route , The return journey is IP Routing as an example . The judgment method of other situations should be determined according to the actual networking situation , It must be ensured that BFD The outgoing and return paths of the session message are consistent .
stay RouterA Inquire about BFD Session neighbor information .
# In the user view , perform display bfd session all verbose Command view RouterA To RouterB Of BFD Neighborhood information . Bold font is RouterA To RouterB Of BFD Conversation neighbors and next hop .
display bfd session all verbose
State : Up Name : dyn_16396
Local Discriminator : 16396 Remote Discriminator : 16392
Session Detect Mode : Asynchronous Mode Without Echo Function
BFD Bind Type : TE_LSP
Bind Session Type : Dynamic
Bind Peer IP Address : 10.2.2.2
NextHop Ip Address : 10.1.1.2 …
- stay RouterB Inquire about BFD Neighbor information of the session .
# In the user view , perform display bfd session all verbose Command view RouterB To RouterA Of BFD Neighborhood information . Bold font is RouterB To RouterA Of BFD Conversation neighbors .
display bfd session all verbose
(Multi Hop) State : Up Name : dyn_16392
Local Discriminator : 16392 Remote Discriminator : 16396
Session Detect Mode : Asynchronous Mode Without Echo Function
BFD Bind Type : Peer IP Address
Bind Session Type : Entire_Dynamic
Bind Peer IP Address : 10.1.1.1
…
- stay RouterB Query to RouterA Routing information for .
In the user view , perform display ip routing table ip address mask verbose Command query RouterB To RouterA Routing information for . Bold font is RouterB To RouterA The next hop of the route .BFD Session from RouterA To RouterB My next jump is 10.1.1.2 , And from RouterB To RouterA My next jump is 10.2.1.2 BFD The round-trip path of the session message is inconsistent .
display ip routing-table 10.1.1.1 32 verbose
Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route
Routing Table : public
Summary Count : 1
Destination: 10.1.1.1/32
Protocol: ISIS-L2 Process ID: 1
Preference: 15 Cost: 10
NextHop: 10.2.1.2 Neighbour: 0.0.0.0
State: Inactive Adv Age: 1d04h15m09s
Tag: 0 Priority: high
Label: NULL QoSInfo: 0x0
IndirectID: 0xE600087A
RelayNextHop: 0.0.0.0 Interface: GigabitEthernet0/5/5
TunnelID: 0x0 Flags:
Risk recovery plan
Please configure according to the configuration specification .
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