How does an S series switches process packets if it fails to obtain the net-hop address from the FIB table


After an S series switches (except the S1700) receives a packet, if the switch cannot find the next-hop address in the FIB table and no default route is configured, the packet will be discarded.

Other related questions:
Routing table and FIB table
The functions and meanings of the routing table and FIB table are as follows: Routers forward packets based on routing tables and forwarding information base (FIB) tables. Each router maintains at least one routing table and one FIB table. A routing table stores routes discovered by various routing protocols. Routes are classified into the following types based on the origin: -Direct route: is discovered by link layer protocols. -Static route: is manually configured by network administrators. -Dynamic route: is discovered by dynamic routing protocols. Each entry in the FIB table contains the physical or logical interface through which a packet is sent to a network segment or host to reach the next router. An entry also indicates whether the packet can be sent to a destination host in a directly connected network.

Download MIB file of S series switch
Download MIB files for S series switches (except S1700 switches) as follows: Access Choose Support > Bulletins > Service Bulletin > MIB Files > Enterprise Network.

How does an S series switch process UDP packets when it functions as a Layer 2 switch
If an S series switch (except the S1700) functions as a Layer 2 switch, it does not identify UDP or TCP packets by default. The switch only forwards packets based on its original MAC address table.

S series switches will how to deal with can not get the next hop from the FIB table
If the next hop cannot be found in the FIB table and there is no default route when S series switches (except S1700) received the packet,the packet will be discarded.

How does an S series switches process received routing protocol packets
Q: How does an S series switches process received routing packets? A: After receiving a routing protocol packet, an S series switches sends it to the MPU. After calculation, the MPU delivers control messages to an LPU for routing information updates.

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