From: k c (jwongccie@yahoo.com.hk)
Date: Thu Dec 25 2003 - 03:57:55 GMT-3
Since the vlan is attached to FE interface, therefore the bandwidth should be same as FE in order to reflect the real cost of FE. Back to my previous question, does it necessary to change the Vlan interface bandwidth to 100000 if the question doesn't mention? If not, ospf cost of this interface doesn't reflect FE. Any comment?
Marvin Greenlee <marvingreenlee@yahoo.com> wrote:The cost is determined by dividing the reference
bandwidth by the interface bandwidth.
Why would you want the VLAN to be the same bandwidth
as FE. What is wrong with a bandwidth of 1G? An
up/up gigabit port on a 3550 will show a b/w of 1G.
Sincerely,
Marvin Greenlee
--- k c wrote:
> Sorry, I haven't checked the int vlan b/w default
> setting. It is 1000M. Do I need to change it to 100M
> to reflect the real cost of FE if the question
> doesn't mention?
>
> Switch1>sh int vlan 101
> Vlan101 is up, line protocol is up
> Hardware is EtherSVI, address is 000d.293e.1f00
> (bia 000d.293e.1f00)
> Internet address is 9.9.9.9/24
> MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
>
> k c wrote:
> Hi group,
>
> It is stange that the auto-cost ref-bw is different
> for vlan and router-port. Any idea? By default, vlan
> reference to 1000M and router port reference to
> 100M?
>
> interface FastEthernet0/17
> no switchport
> ip address 1.1.1.1 255.255.255.0
> end
> interface FastEthernet0/20
> switchport access vlan 101
> switchport mode dynamic desirable
> no ip address
> end
> interface Vlan101
> ip address 9.9.9.9 255.255.255.0
> end
>
> When auto-cost reference-bandwidth set to 1000
>
> Switch1#sh ip ospf int f0/17
> FastEthernet0/17 is up, line protocol is up
> (connected)
> Internet Address 1.1.1.1/24, Area 0
> Process ID 1, Router ID 218.102.19.174, Network
> Type BROADCAST, Cost: 10
> Switch1#sh ip ospf int vlan 101
> Vlan101 is up, line protocol is up
> Internet Address 9.9.9.9/24, Area 0
> Process ID 1, Router ID 218.102.19.174, Network
> Type BROADCAST, Cost: 1
> Transmit Delay is 1 sec, State DR, Priority 1
>
> When auto-cost reference-bandwidth set to 10000
>
> Switch1#sh ip ospf int f0/17
> FastEthernet0/17 is up, line protocol is up
> (connected)
> Internet Address 1.1.1.1/24, Area 0
> Process ID 1, Router ID 218.102.19.174, Network
> Type BROADCAST, Cost: 100
> Switch1#sh ip ospf int vlan 101
> Vlan101 is up, line protocol is up
> Internet Address 9.9.9.9/24, Area 0
> Process ID 1, Router ID 218.102.19.174, Network
> Type BROADCAST, Cost: 10
>
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