Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 258
  • Last Modified:

Routing in switch

Hi,
I have server vlans in a switch and ip routing is enabled
when i do sh ip route it gives me one specific route is going from 1 vlan
but that Vlan has many interface , who can i find which interface the traffic is going from ?
specifically when we have many trunk links in that vlan.

Regards
Nitin Mohan
0
mohannitin
Asked:
mohannitin
  • 2
  • 2
1 Solution
 
giltjrCommented:
Do you understand how routing works?

Each IP host has a default route.  They may also have other routes for specific IP subnets.  Typically all hosts within the same subnet have the same routeing table.

Each IP host will look at its route table to see what router to forward traffic to.
0
 
mohannitinAuthor Commented:
if i am correct , the traffic from switch vlan would be forwarded from root port of that vlan.
as soon as it reaches the root switch will forward the traffic to specific subnet using routing table
0
 
giltjrCommented:
Not really.  When you are talking VLAN's and root port, that is layer 2, switching, not layer 3 routing.

For routing the sending host looks at its routing table to find out what IP route to take to send to the target host.

If the sending and target are on the same subnet, the sending host issues a ARP to find the target host's MAC address and then sends the packet within a layer 2 frame.  That is where the VLAN/layer 2 path comes into play.  You only have a "root path" if  you have multiple layer 2 connections between layer 2 devices and you are using spanning tree to prevent loops.

If the sending host and the target host are not in the same subnet, the sending host finds the IP address of the next hop, that is the router it should use to forward the packet to the target host.  The router and the sending host will be on the same subnet, so the sending host will send a ARP to the router to get its MAC address.  It then sends the packet to the MAC address of the router.  The router will then look at the target host's IP address and look at its routing table to see how to get to the target host.
0
 
mohannitinAuthor Commented:
awesome answer , thanks for the clarification
0

Featured Post

Fill in the form and get your FREE NFR key NOW!

Veeam is happy to provide a FREE NFR server license to certified engineers, trainers, and bloggers.  It allows for the non‑production use of Veeam Agent for Microsoft Windows. This license is valid for five workstations and two servers.

  • 2
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now