From: Nick (ccieaz@googlemail.com)
Date: Tue Dec 16 2008 - 22:10:31 ARST
Thanks for your help there
2008/12/17 Huan Pham <Huan.Pham@peopletelecom.com.au>
>
> Hi Nick,
>
> My understanding is that, when traffic already arrives on that port, it
> is too late to tag it.
>
> With your given command, the switch will treat any incoming UNTAGGED
> packets as VLAN146 traffic. The IOS online help is quite clear on this:
>
> Rack1SW1(config)#monitor session 1 destination interface fa0/24 ingress
> ?
> dot1q ingress forwarding using dot1q encapsulation
> isl ingress forwarding using isl encapsulation
> untagged ingress forwarding using untagged encapsulation
> vlan Set default VLAN for untagged ingress traffic
>
> Rack1SW1(config)#$sion 1 destination interface fa0/24 ingress dot1q vlan
> ?
> <1-4094> Default VLAN for untagged ingress traffic
>
>
> If you have another trunk to other switch, untagged traffic coming to
> Fa0/24 when being forwarded to the other switch will have VLAN146 tag
> (unless the trunk has Dot1Q encapsultion and native VLAN is 146).
>
> On the other hand, if it is forwarded to another VLAN 146 access port,
> there will be no tagging at all.
>
> Regards,
>
>
> Huan
>
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Nick
> Sent: Wednesday, 17 December 2008 9:34 AM
> To: Cisco certification
> Subject: SPAN Ingress
>
> Can anyone help me understand the following command:
>
> monitor session 1 destination interface fa0/24 ingress vlan 146
>
> Is this saying that as well as being the destination for SPAN session 1,
> any packets coming into port f0/24 will be tagged with vlan 146?
>
>
> Thanks
>
> --
> ---
>
> Nick
>
>
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-- ---Nick
Blogs and organic groups at http://www.ccie.net
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