Dell S4048T User Manual

• Establish sessions with IS-IS neighbors on a single interface.
INTERFACE mode
isis bfd all-neighbors
Example of Verifying Sessions with IS-IS Neighbors
To view the established sessions, use the show bfd neighbors command.
The bold line shows that IS-IS BFD sessions are enabled.
R2(conf-router_isis)#bfd all-neighbors
R2(conf-router_isis)#do show bfd neighbors
* - Active session role
Ad Dn - Admin Down
C - CLI
I - ISIS
O - OSPF
R - Static Route (RTM)
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
* 2.2.2.2 2.2.2.1 Te 2/1 Up 100 100 3 I
Changing IS-IS Session Parameters
BFD sessions are configured with default intervals and a default role.
The parameters that you can configure are: Desired TX Interval, Required Min RX Interval, Detection Multiplier,
and system role. These parameters are configured for all IS-IS sessions or all IS-IS sessions out of an interface.
If you change a parameter globally, the change affects all IS-IS neighbors sessions. If you change a parameter
at the interface level, the change affects all IS-IS sessions on that interface.
To change parameters for all IS-IS sessions or for IS-IS sessions on a single interface, use the following
commands.
To view session parameters, use the show bfd neighbors detail command, as shown in Verifying BFD
Sessions with BGP Neighbors Using the show bfd neighbors Command in
Displaying BFD for BGP Information.
• Change parameters for all IS-IS sessions.
ROUTER-ISIS mode
bfd all-neighbors interval milliseconds min_rx milliseconds multiplier value
role [active | passive]
• Change parameters for IS-IS sessions on a single interface.
INTERFACE mode
isis bfd all-neighbors interval milliseconds min_rx milliseconds multiplier
value role [active | passive]
Disabling BFD for IS-IS
If you disable BFD globally, all sessions are torn down and sessions on the remote system are placed in a
Down state.
If you disable BFD on an interface, sessions on the interface are torn down and sessions on the remote
system are placed in a Down state. Disabling BFD does not trigger a change in BFD clients; a final Admin
Down packet is sent before the session is terminated.
Bidirectional Forwarding Detection (BFD) 194

Dell S4048T Specifications

General

Switching Capacity	1.44 Tbps
Rack Units	1U
Form Factor	Rack-mountable
Power Device	Internal power supply
Power Redundancy	Optional
Product Type	Switch
Jumbo Frame Support	Yes
Routing Protocol	OSPF, BGP, RIP, VRRP, PIM-SM, IGMP
Remote Management Protocol	SNMP, RMON, Telnet, SSH
Features	Quality of Service (QoS), Jumbo Frames Support, Virtual Route Redundancy Protocol (VRRP), VLAN support, sFlow, Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), IPv6 support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3ae
Dimensions (W x D x H)	17.3 in x 16 in x 1.7 in
Operating Temperature	0°C to 40 °C
Operating Humidity	10% to 90% (non-condensing)