H3C Technologies H3C S12500-X Series Switches - Manual (Page 75)

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Protocols and standards
• RFC 5880, Bidirectional Forwarding Detection (BFD)
• RFC 5881, Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop)
• RFC 5882, Generic Application of Bidirectional Forwarding Detection (BFD)
• RFC 5883, Bidirectional Forwarding Detection (BFD) for Multihop Paths
• RFC 5884, Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs)
• RFC 5885, Bidirectional Forwarding Detection (BFD) for the Pseudowire Virtual Circuit Connectivity
Verification (VCCV)
Configuring BFD basic functions
Before configuring BFD basic functions, configure the network layer addresses of the interfaces so that
adjacent nodes are reachable to each other at the network layer.
After a BFD session is established, the two ends negotiate BFD parameters, including minimum sending
interval, minimum receiving interval, initialization mode, and packet authentication, by exchanging
negotiation packets. They use the negotiated parameters without affecting the session status.
Configuring echo packet mode
Step Command Remarks
1. Enter system view. system-view N/A
2. Configure the source IP
address of echo packets.
• Configure the source IP address
of echo packets:
bfd echo-source-ip ip-address
• Configure the source IPv6
address of echo packets:
bfd echo-source-ipv6
ipv6-address
Use either command.
By default, no source IP address is
configured for echo packets.
The source IP address cannot be on
the same network segment as any
local interface's IP address.
Otherwise, a large number of
ICMP redirect packets might be
sent from the peer, resulting in link
congestion.
The source IPv6 address of echo
packets can only be a global
unicast address.
3. Enter interface view.
interface interface-type
interface-number
N/A
4. (Optional.) Configure the
minimum interval for receiving
BFD echo packets.
bfd min-echo-receive-interval
value The default setting is 400
milliseconds.
5. (Optional.) Configure the
single-hop detection time
multiplier.
bfd detect-multiplier value The default setting is 5.