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Gigabit Uplinks


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Gigabit Uplinks

Network traffic going to all switches in the network instead of only the hops needed.?

I have two core cisco switches (6500 and 4500) that have servers connected directly to them, and the 6500 and 4500 are directly connected via fiber. The source server on vlan1 on the 6500 sends out around 60megs of traffic to the destination server on vlan2 of the 4500. For some reason all this TCP traffic is presented to all the other switches in the network. All the gigabit uplinks on the switches see this 60meg spike in traffic, yet none of these switches are a hop between the source and destination. This traffic spike across all the switches in the network is causing problems. Help Help Help!!!
Layer three switches, and the traffic goes through the core switches and not our router.

You don’t indicate whether the fiber uplinks are layer 2 or layer 3 uplinks. If they are layer 2 uplinks and all of the switch ports are on the same logical vlan the broadcast traffic will flood all ports. Are the fiber ports configured as trunks or access ports? Where are the vlans routed from?

This is a difficult question to answer with any certainty without seeing the configs on the switches and knowing where the routing for vlan1 and vlan2 resides.
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Update: Even though you indicate that they are layer 3 switches, that doesn't necessarily mean that the uplinks are layer 3. You need to…

1. Determine whether the uplinks need to be layer 2 or 3. To do this you need to…
a. Determine whether or not the same vlan(s) exist on both switches or not.
b. If the same vlan(s) exist on both switches the uplinks must be layer 2.
c. If not, the uplinks can be layer 3 and no broadcast traffic will be shared between switches.

2. Check the configs on the ports that are used for uplinks between the switches and look for…
a. IP addresses… IP addresses are layer 3 addresses.
b. If you see IP addresses the uplinks are layer 3. A layer 3 port config would look something like this…

interface GigabitEthernet1/1
ip address 10.0.0.5 255.255.255.252

c. If you do not see IP addresses you should see a trunk config, which would look something like this…

interface GigabitEthernet1/1
switchport
switchport trunk encapsulation dot1q
switchport mode trunk

d. Or, if you are only using a single vlan across the uplink you might see an access port config, which would look something like this…

interface GigabitEthernet1/1
switchport access vlan 1
switchport mode access
spanning-tree portfast

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