Mode of the switch port to connect to a router
I wonder what mode to set the switchport is connected to a router.
I guess the cable between the router is connected to a port in trunk mode (for all the VLANS defined)? Then I Lass with gateways for VLANs pointing to the router routing interfaces?
So in this way, if a neighboring switch does not know how to route a packet to an unknown IP address, the packet is sent on the trunk to the other switch. Here the appropriate VLAN SVI sends the packet to the appropriate router interface. Is this correct or nearly correct?
Hi Atle,
You can connect a trunk port or port access to a router. If you choose to use an access port, the router will form an adjacency only through the VIRTUAL LAN defined in this access port. If you choose a trunk port, you can use dot1q encapsulation on subinterfaces of adjacencies form on several VLANs. If you use a trunk you would this type of configuration:
On the switch:
item in gi1/0/1 interface
switchport mode trunk
switchport trunk encapsulation dot1q
switchport trunk allowed vlan a to c
On the router
gi0/0.a interface
encapsulation dot1q one
IP address x.x.x.x y.y.y.y
!
interface gi0/0.b
encapsulation dot1q b
IP address v.v.v.v y.y.y.y
!
interface gi0/0.c
encapsulation dot1q c
IP address z.z.z.z y.y.y.y
Here's a good tutorial on this subject:
http://www.howtonetwork.NET/public/708.cfm
Cisco service documentation:
http://www.Cisco.com/en/us/docs/iOS/12_0t/12_0t1/feature/guide/8021Q.html
To answer your question, you can use the router as a default gateway for hosts. In this case, should not have an IVR on the switch, except for MANAGEMENT purposes. Traffic from the hosts would take the path of the L2 to the router and then the router would make the next decision of transfer for the package. If you have two routers, you could do a safe for both routers and run a FHRP between them for redundancy.
HTH
Anthony
Tags: Cisco Network
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