What is the default IFG on a switch

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Two Ethernet frames must have an interframe gap (IFG) to differentiate two data packets. A device uses the IFG to process a data frame after receiving it and prepares for the receiving of the next data frame. The default IFG on a switch is 12 bytes. You are advised not to change the IFG on an interface, otherwise, packet loss may occur when the interface forwards packets.

You can run the ifg ifg-value command to configure the IFG between Ethernet frames.

Only S5700-X-LI supports the IFG.

For the S2700, the ifg command changes the IFG on all the interfaces.

Other related questions:
Do traffic statistics on an interface contain the IFG and preamble
By default, traffic statistics on an interface contain the interframe gap (IFG) and preamble. You can run the undo set flow-statistics include-interframe command to configure the device not to count the bytes in the IFG and preamble when collecting traffic statistics on an interface. You can run the display interface command to view the running status and traffic statistics on an interface. The Last 300 seconds input rate or Last 300 seconds output rate field in the command output indicates the inbound or outbound traffic rate on the interface in the last 300 seconds. If you want to obtain the total number of bytes passing through an interface in a period, configure the device to count the bytes in the IFG and preamble when collecting traffic statistics on the interface. The interface traffic rate is as follows: Interface traffic rate = (Original packet length + IFG + Preamble) x Number of packets passing through the interface every second If you want to obtain only the number of packet bytes passing through an interface in a period, configure the device not to count the bytes in the IFG and preamble when collecting traffic statistics on the interface. The interface traffic rate is as follows: Interface traffic rate = Original packet length x Number of packets passing through the interface every second By default, the IFG has a fixed value of 12 bytes and the preamble has a fixed value of 8 bytes or 20 bytes. You can run the ifg command to configure the IFG.

What is the default user level on CE series switches
User levels determine operation permission of users. For CE series switches, there are 16 user levels that range from level 0 to 15. A larger value indicates a higher level. By default, the level of a user logging in to a switch through the console port is 15, and the level of a Telnet/Stelnet user is 0.

What is the default load balancing mode
By default, Eth-Trunks work in manual load balancing mode.

Routing protocol preference on S series switches
Preference of routing protocols Different routing protocols, including the static routing protocol may discover different routes to the same destination, but not all these routes are optimal. At a certain moment, only one routing protocol determines the preferred route to a certain destination. To select the optimal route, routes of these routing protocols including the static route are configured with preferences. When multiple sources of routing information exist, the route learned by the routing protocol with the highest preference (a smaller value indicates a higher preference) becomes the optimal route. The optimal route is then saved to the local routing table. Routers define the external preference and internal preference. External preferences are manually configured for routing protocols. The following lists the default external preferences of routing protocols: - Direct: 0 - OSPF: 10 - IS-IS: 15 - Static: 60 - RIP: 100 - OSPF ASE: 150 - OSPF NSSA: 150 - IBGP: 255 - EBGP: 255 Note: Value 0 indicates direct routes and value 255 indicates routes learned from unreliable sources. A smaller value indicates a higher preference. Except for direct routes, the priorities of routing protocols can be manually configured. In addition, the preference of each static route varies. Internal preferences of routing protocols cannot be manually configured. The following lists the internal preferences of routing protocols: - Direct: 0 - OSPF: 10 - IS-IS Level-1: 15 - IS-IS Level-2: 18 - Static: 60 - RIP: 100 - OSPF ASE: 150 - OSPF NSSA: 150 - IBGP: 200 - EBGP: 20 During route selection, a router first compares the external preferences of routes. When the same external preference is set for different routing protocols, the router selects the optimal route based on the internal preference. For example, two routes (an OSPF route and a static route) are available. Both routes can reach the destination 10.1.1.0/24, and the preferences of the two routes are set to 5. In this case, the router determines the optimal route according to the internal preferences. The internal preference (the value is 10) of OSPF is higher than that (the value is 60) of the static route. Therefore, the router selects the route discovered by OSPF as the optimal route.

What is the default STP mode for S series switches
For S (except the S1700) and E series switches, STP works in MSTP mode by default.

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