Re: Ether Channel Query!!

hey Hameer i m asking about loop avoiding mechanism .If both the ports are
forwarding and STP is not aware of the both the ports,then thee will be a
chance of loop forming on that particular channel

On Mon, Sep 27, 2010 at 10:01 PM, --Hammer-- <bhmccie_at_gmail.com> wrote:

> Someone step in if I mis-quote something.
>
> You're statement is a bit off. STP is not forwarding on both ports. STP is
> forwarding on the port-channel. STP is no longer aware of the individual
> ports. How the channel handles STP traffic is a different matter. I don't
> think STP sends traffic on both ports in a LACP or PAGP channel. I think the
> L2 protos (STP, CDP, DTP, etc) are just passed on the primary link. I'm not
> where I can google this to confirm it. Anyone?
>
> --Hammer--
>
>
> On 9/27/2010 11:25 AM, HEMANTH RAJ wrote:
>
> Hey If STP has forwarding both ports, then there will be chance of loop
> formation
> wat is the actual mechanism
> how does it prevent loops at the same time it makes all the ports
> forwarding
>
> can anyone explain me?
>
>
> On Mon, Sep 27, 2010 at 8:39 PM, --Hammer-- <bhmccie_at_gmail.com> wrote:
>
>> Thanks Saulat for the quick lab up....
>>
>> --Hammer--
>>
>>
>>
>> On 9/27/2010 9:51 AM, Saulat Ali wrote:
>>
>>> The bundled ports wont show up in the sh spantree command unless you
>>> type in sh span int<physical port> which will show them in forwarding
>>> state. As mentioned by Hammer as soon as you put the physical port into
>>> an ether channel spanning tree process only shows the logical port in
>>> the sh span tree.
>>>
>>> See below e.g .. port 1/0/52 and 2/0/52 wont show up in the span tree
>>> process but you can view their status by entering sh span<vlan> int gig
>>> 1/0/52<detail> command,
>>>
>>> #sh etherchannel summ
>>>
>>> Group Port-channel Protocol Ports
>>> ------+-------------+-----------+---------------------------------------
>>> --------
>>> 1 Po1(SU) LACP Gi1/0/52(P) Gi2/0/52(P)
>>>
>>> #sh run int gig 1/0/52
>>> Building configuration...
>>>
>>> Current configuration : 181 bytes
>>> !
>>> interface GigabitEthernet1/0/52
>>> switchport trunk encapsulation dot1q
>>> switchport mode trunk
>>> switchport nonegotiate
>>> channel-group 1 mode active
>>> end
>>>
>>> #sh run int gig 2/0/52
>>> Building configuration...
>>>
>>> Current configuration : 181 bytes
>>> !
>>> interface GigabitEthernet2/0/52
>>> switchport trunk encapsulation dot1q
>>> switchport mode trunk
>>> switchport nonegotiate
>>> channel-group 1 mode active
>>> end
>>>
>>> #sh run int po1
>>> Building configuration...
>>>
>>> Current configuration : 144 bytes
>>> !
>>> interface Port-channel1
>>> switchport trunk encapsulation dot1q
>>> switchport mode trunk
>>> switchport nonegotiate
>>> end
>>>
>>>
>>> #sh span vlan 2
>>> VLAN0002
>>> Spanning tree enabled protocol rstp
>>> Root ID Priority 24578
>>> Address 0022.be9f.ab80
>>> This bridge is the root
>>> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
>>>
>>> Bridge ID Priority 24578 (priority 24576 sys-id-ext 2)
>>> Address 0022.be9f.ab80
>>> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
>>> Aging Time 300
>>>
>>> Interface Role Sts Cost Prio.Nbr Type
>>> ---------------- ---- --- --------- --------
>>> --------------------------------
>>> Po1 Desg FWD 3 128.616 P2p
>>>
>>>
>>> #sh spanning-tree vlan 2 int gi2/0/52 de
>>> Port 616 (Port-channel1) of VLAN0002 is designated forwarding
>>> Port path cost 3, Port priority 128, Port Identifier 128.616.
>>> Designated root has priority 24578, address 0022.be9f.ab80
>>> Designated bridge has priority 24578, address 0022.be9f.ab80
>>> Designated port id is 128.616, designated path cost 0
>>> Timers: message age 0, forward delay 0, hold 0
>>> Number of transitions to forwarding state: 1
>>> Link type is point-to-point by default
>>> BPDU: sent 25045070, received 73
>>>
>>> #sh spanning-tree vlan 2 int gig1/0/52 de
>>> Port 616 (Port-channel1) of VLAN0002 is designated forwarding
>>> Port path cost 3, Port priority 128, Port Identifier 128.616.
>>> Designated root has priority 24578, address 0022.be9f.ab80
>>> Designated bridge has priority 24578, address 0022.be9f.ab80
>>> Designated port id is 128.616, designated path cost 0
>>> Timers: message age 0, forward delay 0, hold 0
>>> Number of transitions to forwarding state: 1
>>> Link type is point-to-point by default
>>> BPDU: sent 25045075, received 73
>>>
>>> #sh spanning-tree vlan 2 int po1 de
>>> Port 616 (Port-channel1) of VLAN0002 is designated forwarding
>>> Port path cost 3, Port priority 128, Port Identifier 128.616.
>>> Designated root has priority 24578, address 0022.be9f.ab80
>>> Designated bridge has priority 24578, address 0022.be9f.ab80
>>> Designated port id is 128.616, designated path cost 0
>>> Timers: message age 0, forward delay 0, hold 0
>>> Number of transitions to forwarding state: 1
>>> Link type is point-to-point by default
>>> BPDU: sent 25045080, received 73
>>>
>>> -----Original Message-----
>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>>> CCIE KID
>>> Sent: 27 September 2010 15:29
>>> To: --Hammer--
>>> Cc: ccielab_at_groupstudy.com
>>> Subject: Re: Ether Channel Query!!
>>>
>>> Hey can u explain me the process and what r the packets exchanged so
>>> that
>>> how does STP come to know that that the particular port is bundled
>>>
>>> What will be in the sh spanning-tree detail for that particular port
>>> which
>>> is been blocking
>>> Whether it will be of forwarding state
>>>
>>> That bundled link will be in which state in forwarding state in STP ah??
>>> pls brief me about that??
>>>
>>> On Mon, Sep 27, 2010 at 7:51 PM, --Hammer--<bhmccie_at_gmail.com> wrote:
>>>
>>> CCIE KID,
>>>> When you "bond" the two physical interfaces into a logical port
>>>>
>>> channel,
>>>
>>>> you will pass traffic over both Fa0/1 and Fa0/2. STP treats the entire
>>>> collection of physical interfaces as a single logical port. This is
>>>>
>>> all
>>>
>>>> negotiated between the endpoints. Does that help?
>>>>
>>>> --Hammer--
>>>>
>>>>
>>>>
>>>> On 9/27/2010 9:17 AM, CCIE KID wrote:
>>>>
>>>> I have a doubt in ether Channel
>>>>>
>>>>> This is my scenario
>>>>>
>>>>> SW1 fa0/1-------------------------------------------fa 0/1 SW2
>>>>> fa0/2-------------------------------------------fa 0/2
>>>>>
>>>>> In STP SW1 is the root bridge and SW2 is the non root bridge , In SW2
>>>>>
>>>> fa
>>>
>>>> 0/1
>>>>> is in forwarding state and fa 0/2 is in blocking state .
>>>>> So in Ether channel, if we bundle fa0/1 and fa 0/2 ,traffic cannot be
>>>>> passed
>>>>> through fa 0/2 .
>>>>> How Ether Channel informs STP about the bundling and makes the fa 0/2
>>>>>
>>>> into
>>>
>>>> forwarding
>>>>> Can anyone explain me the process
>>>>> I am expecting the experts to explain
>>>>>
>>>>>
>>>>>
>>>>> With Warmest Regards,
>>>>>
>>>>> CCIE KID
>>>>> IN PURSUIT OF CCIE
>>>>>
>>>>>
>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>
>>>>>
>>>>>
>>> _______________________________________________________________________
>>>
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>>>
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>>
>>
>>
>>
>>
>>
>>
>
>
> --
> Problems arise Bcoz we talk,prblms r not solve bcoz we dont talk So gud r
> bad talk to ur affectionate one's freely
>
> Urs Friendly,
> HP HEMANTH RAJ
>
>

-- 
Problems arise Bcoz we talk,prblms r not solve bcoz we dont talk So gud r
bad talk to ur affectionate one's freely
Urs Friendly,
HP HEMANTH RAJ
Blogs and organic groups at http://www.ccie.net