Configuring Layer 3 Features > Configuring Routing Information Protocol (RIP) > Support for Bidirectional Forwarding Detection on Static Routes
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Support for Bidirectional Forwarding Detection on Static Routes
This version of Netvisor ONE provides support for static route reachability detection using Bidirectional Forwarding Detection (BFD) protocol. Netvisor ONE installs a static route entry in the Routing Information Database (RIB) only if BFD can communicate with the gateway. After installation, BFD periodically monitors reachability and removes the route if connectivity is lost.
When you configure a vRouter as a gateway, Netvisor ONE sends out BFD hellos periodically to specified neighbors. You configure static BFD sessions for this purpose.
Currently when you create a static route, Netvisor ONE installs a route entry in RIB regardless of the reachability of the gateway. By making static routes conditional over BFD, neighborship formation alleviates this problem.
Netvisor ONE now provides new parameters to configure static BFD sessions between a Netvisor ONE vRouter and any remote routers supporting BFD. The vRouter sends out periodic BFD packets to these neighbors, so that the routers can determine if the Netvisor ONE vRouter, acting as a gateway, is alive or not.
If the BFD destination IP address matches with a static route gateway IP address, Netvisor ONE considers the static route BFD enabled. Netvisor ONE installs the static route in the RIB only for active BFD sessions. Netvisor ONE creates the BFD sessions on a per gateway basis, in that different static routes using the same gateway, use the same BFD session to determine connectivity.
If the BFD session goes down, Netvisor ONE removes all such static routes from the RIB. The source address for the BFD session consists of the interface address of any vRouter interface (vnic) or a loopback interface.
BFD timers can be specified for the vRouter interface or the loopback interface.
CLI Commands
 
vrouter-static-bfd-add
Add a static BFD session
vrouter selector:
 
vrouter-name name-string
Specify the name of the vRouter service configuration to add BFD
the following static-bfd arguments:
 
src-ip ip-address
Specify the source IP address for the BFD session.
dst-ip ip-address
Specify the destination IP address for the BFD session.
type single-hop|multi-hop
Specify the BFD type.
 
vrouter-static-bfd-remove
Remove a static BFD session
 
vrouter selector:
 
vrouter-name name-string
Specify the name of the vRouter service configuration to add BFD.
the following static-bfd arguments:
 
src-ip ip-address
Specify the source IP address for the BFD session.
dst-ip ip-address
Specify the destination IP address for the BFD session.
 
vrouter-static-bfd-show
Displays a static BFD session
vrouter selector:
 
vrouter-name name-string
Displays the name of the vRouter service configuration to add BFD
the following static-bfd arguments:
 
src-ip ip-address
Displays the source IP address for the BFD session
dst-ip ip-address
Displays the destination IP address for the BFD session
type single-hop|multi-hop
BFD type
 
The source IP address is a vRouter interface (vnic) or a loopback interface.
CLI network-admin@switch > vrouter-static-bfd-show
vrouter-name src-ip dst-ip type
------------ -------------- --------- ----------
vr1 100.1.1.1 200.1.1.1 single-hop
vr1 100.1.1.1 201.1.1.1 multi-hop
 
The vrouter-static-route-show command displays if a route is BFD-enabled or not. If you configure BFD, Netvisor ONE displays the configured source IP for the session.
Example output of static routes configured with BFD:
CLI network-admin@switch > vrouter-static-route-show
vrouter-name network gateway-ip distance bfd bfd-src-ip
------------ ------------ ---------- -------- --- ---------
vr1 101.1.1.0/24 201.1.1.1 1 single-hop 100.1.1.1
vr1 102.1.1.0/24 202.1.1.1 1 multi-hop 100.1.1.1
vr1 103.1.1.0/24 203.1.1.1 1                            
 
In addition, the existing command, vrouter-bfd-neighbor-show displays any static BFD neighbor information.
The existing commands, vrouter-interface-config-add and vrouter-interface-config-modify can be used to configure BFD timers.