Answered Essay: Give forwarding tables for each of the switches S1-S4 in the following network with destinations A, B, C, D.

Give forwarding tables for each of the switches S1-S4 in the following network with destinations A, B, C, D. For the next_hop column, give the neighbor on the appropriate link rather than the interface number.

A         B         C
│         │         │
S1────────S2────────S3
          │
          │
          S4───D

Expert Answer

 

Forwarding table for Switch S1:

Destination Link to be followed
A S1–A
B S1–B
C S1–S2
D S1–S4

Forwarding Table for Switch S2:

DESTINATION LINK TO BE FOLLOWED
A S2–S1
B S2–B
C S2–C
D S2–S4

Forwarding Table for Switch S3:

DESTINATION LINK TO BE FOLLOWED
A S3–S2
B S3–S2
C S3–S2
D S3–S2

Forwarding Table for Switch S4:

DESTINATION LINK TO BE FOLLOWED
A S4–S1
B S4–B
C S4–S2
D S4–D

A forwarding table is a table stored in the each switch which allows that switch to select the next hop to deliver the packet to the required destination.

For Example:

In given network if switch S4 receives a packet with destination as C. Then S4 send the packet to switch S2 and then switch S2 forwards the packet to C which is the destination.

Without the forwarding table switches cannot identify to which node to forward the packet.

Explination for Forward table of network:

In the given network if

1)Switch S1 received a message with destination

  • A- Then it will forward the packet through the link S1–A
  • B-Then it forwards the packet through link S1–B
  • C-Then it forwards the packet through link S1–S2
  • D-Then it forwards the packet through link S1–S4

2)Switch S2 received a message with destination

  • A- Then it will forward the packet through the link S2–S1
  • B-Then it forwards the packet through link S2–B
  • C-Then it forwards the packet through link S2–C
  • D-Then it forwards the packet through link S2–S4

3)Switch S3 received a message with destination

  • A- Then it will forward the packet through the link S3–S2
  • B-Then it forwards the packet through link S3–S2
  • C-Then it forwards the packet through link S3–S2
  • D-Then it forwards the packet through link S3–S2

4)Switch S4 received a message with destination

  • A- Then it will forward the packet through the link S4–S1
  • B-Then it forwards the packet through link S4–B
  • C-Then it forwards the packet through link S4–S2
  • D-Then it forwards the packet through link S4–D

Consider now that S3 received a packet which has destination as D, According to our forwarding table

1)S3 forwards this packet through link S3—S2. So S2 receives the packet with destination D.

2) S2 forwards the packet through link S2–S4. So, S4 receives packet with destination D.

3)S4 forwards the packet through link S4-D. So, now D receives the packet that is intended for it.

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