--- On Wed, 1/16/13, Amit <[email protected]> wrote:
From: Amit <[email protected]>
Subject: Re: [c-nsp] ISIS P2P Behaviour with L2 Switch
To: "Pete Lumbis" <[email protected]>
Date: Wednesday, January 16, 2013, 5:00 AM
In my case router is sending vlan tags and is configured with dot1q three
seprate subinterfaces vlan 10,20 and 30 , three seprate p2p adjancies , Now
connecting router port on switch is trunk port, How switch will identify the
hellos or distinguish hellos between three vlans , IIH pdus carried on layer 2
frame doesn't have vlan information.
Thanks
Sent from BlackBerry® on Airtel
From: Pete Lumbis <[email protected]>
Date: Tue, 15 Jan 2013 22:17:19 -0500
To: Dhamija Amit<[email protected]>
Subject: Re: [c-nsp] ISIS P2P Behaviour with L2 Switch
Not sure I understand the entire question, but from a high level, regardless of
upper level information (ISIS PDU, IPv4 Packet, IPv6 Packet, etc) the switch is
unaware. When a frame arrives on the switchport it is either put into the vlan
that was assigned ot that port (access port) or the native vlan (frame on a
trunk port without a tag).
In this case, if R1 doesn't send tags, the switch will put the frame in the
native or access vlan for that port and switch the frame only in that VLAN. If
the mac address is an unknown unicast or multicast mac it will be flooded to
all ports within that vlan.
-Pete
On Tue, Jan 15, 2013 at 7:29 PM, Dhamija Amit <[email protected]> wrote:
When R1 sends ISIS hello ( let's say it's a P2P so it want to send hello to R2
only which it includes in IPV4 interface address TLV), When it comes to Switch
, since ISIS Layer 2 Ethernet frame doesn't consists of any specific VLAN
header when frame comes on switch , then from switch point of view it has no
means to identify it comes from R1 (Vlan 10) , then will this hello will be
broadcast to all the remaining routers R2,R3 and R4 ( as destination address is
fixed multicast-address and there is no CAM table for it) ?? or else how
switch will ensure that this specific hello packet is originated from vlan 10
and should only be send to R2.??
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