Rob, If you have 3 switches all connected to each other with etherchannels, STP will still block. You will not see the physical port, but you will see the whole port-channel blocked. Etherchannel allows you to utilize multiple links between 2 devices, it doesn't de-necessitate the use of STP in your entire topology.
Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com On Wed, Jun 3, 2009 at 9:28 AM, Sealander, David <[email protected]> wrote: > If this is on proctor labs, make sure on r2 that port f1/1 is shut down, > or that port f1/0 has no switchport command. > > > > David Sealander, CCNP > Network Systems Engineer > Frederick Memorial Healthcare System > 400 West 7th Street > Frederick, MD 21701 > (240) 566-3768 > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Rob Routt > *Sent:* Wednesday, June 03, 2009 11:21 AM > *To:* Kim Pedersen; prakash patel > *Cc:* [email protected] > > *Subject:* Re: [OSL | CCIE_RS] IPE vol2 lab 3 > > > > Cat1#sh etherchannel summ > Flags: D - down P - bundled in port-channel > I - stand-alone s - suspended > H - Hot-standby (LACP only) > R - Layer3 S - Layer2 > U - in use f - failed to allocate aggregator > > M - not in use, minimum links not met > u - unsuitable for bundling > w - waiting to be aggregated > d - default port > > > Number of channel-groups in use: 3 > Number of aggregators: 3 > > Group Port-channel Protocol Ports > > ------+-------------+-----------+----------------------------------------------- > 1 Po1(SU) - Fa0/19(P) Fa0/20(P) > 2 Po2(SU) - Fa0/21(P) Fa0/22(P) > 3 Po3(SU) - Fa0/23(P) Fa0/24(P) > > > > Cat2(config-if-range)#do sh etherchannel summ > ! > > Number of channel-groups in use: 3 > Number of aggregators: 3 > > Group Port-channel Protocol Ports > > ------+-------------+-----------+----------------------------------------------- > 1 Po1(SU) - Fa0/19(P) Fa0/20(P) > 2 Po2(SU) - Fa0/21(P) Fa0/22(P) > 3 Po3(SU) - Fa0/23(P) Fa0/24(P) > > > > Cat3(config-if-range)#do sh ether summ > ! > > Number of channel-groups in use: 3 > Number of aggregators: 3 > > Group Port-channel Protocol Ports > > ------+-------------+-----------+----------------------------------------------- > 1 Po1(SU) - Fa0/19(P) Fa0/20(P) > 2 Po2(SU) - Fa0/21(P) Fa0/22(P) > 3 Po3(SU) - Fa0/23(P) Fa0/24(P) > > > > Cat4(config-if-range)#do sh ether summ > ! > > Number of channel-groups in use: 3 > Number of aggregators: 3 > > Group Port-channel Protocol Ports > > ------+-------------+-----------+----------------------------------------------- > 1 Po1(SU) - Fa0/19(P) Fa0/20(P) > 2 Po2(SU) - Fa0/21(P) Fa0/22(P) > 3 Po3(SU) - Fa0/23(P) Fa0/24(P) > > > ------------------------------ > > *From:* Kim Pedersen <[email protected]> > *To:* prakash patel <[email protected]> > *Cc:* [email protected]; [email protected] > *Sent:* Wednesday, June 3, 2009 8:06:14 AM > *Subject:* Re: [OSL | CCIE_RS] IPE vol2 lab 3 > > Hi, > > And check out: sh etherchannel summary > > > prakash patel wrote: > > check out if gig link is active to STP!!!! > > > > ------------------------------------------------------------------------ > > Date: Wed, 3 Jun 2009 07:50:38 -0700 > > From: [email protected] > > To: [email protected] > > Subject: [OSL | CCIE_RS] IPE vol2 lab 3 > > > > Guys, I am having some etherchannel woes. I have the following > configuration and have just rebooted the switches to see if that would help. > The task is configure L2 etherchannel group on all switches for ports 19-24. > So 19-20, 21-22, 23-24 channel-groups 1-3 respectively. I keep seeing > spanning tree block when I had thought I would not see this if etherchannel > is working correctly. I have configured and re-configured. I verified my > configuration and re-booted out of frustration. Can you take a look and see > if anything is obvious to you? > > port configs on all switches: > > interface FastEthernet0/19 > > switchport trunk encapsulation isl > > switchport mode trunk > > channel-group 1 mode on > > ! > > interface FastEthernet0/20 > > switchport trunk encapsulation isl > > switchport mode trunk > > channel-group 1 mode on > > ! > > interface FastEthernet0/21 > > switchport trunk encapsulation isl > > switchport mode trunk > > channel-group 2 mode on > > ! > > interface FastEthernet0/22 > > switchport trunk encapsulation isl > > switchport mode trunk > > channel-group 2 mode on > > ! interface FastEthernet0/23 > > switchport trunk encapsulation isl > > switchport mode trunk > > channel-group 3 mode on > > ! > > interface FastEthernet0/24 > > switchport trunk encapsulation isl > > switchport mode trunk > > channel-group 3 mode on > > for example on cat 1 > > Fa0/19 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/20 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/21 connected trunk a-full a-100 > 10/100BaseTX > > Port Name Status Vlan Duplex Speed > Type > > Fa0/22 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/23 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/24 connected trunk a-full a-100 > 10/100BaseTX > > Gi0/1 disabled 1 auto auto > 1000BaseSX SFP > > Gi0/2 disabled 1 auto auto > 1000BaseSX SFP > > Po1 connected trunk a-full a-100 > > Po2 connected trunk a-full a-100 > > Po3 connected trunk a-full a-100 > > Cat1#sh spann block > > Name Blocked Interfaces List > > -------------------- ------------------------------------ > > VLAN0010 Po2 > > VLAN0020 Po2 > > VLAN0030 Po2 > > VLAN0040 Po2 > > VLAN0050 Po2 > > VLAN0060 Po2 > > Number of blocked ports (segments) in the system : 6 > > cat 2 > > Fa0/19 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/20 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/21 connected trunk a-full a-100 > 10/100BaseTX > > Port Name Status Vlan Duplex Speed > Type > > Fa0/22 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/23 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/24 connected trunk a-full a-100 > 10/100BaseTX > > Gi0/1 disabled 1 auto auto > 1000BaseSX SFP > > Gi0/2 disabled 1 auto auto Not > Present > > Po1 connected trunk a-full a-100 > > Po2 connected trunk a-full a-100 > > Po3 connected trunk a-full a-100 > > Cat2#sh spann bloc Name Blocked Interfaces List > > -------------------- ------------------------------------ > > VLAN0001 Po2, Po3 > > Number of blocked ports (segments) in the system : 2 > > cat 3 > > Fa0/19 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/20 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/21 connected trunk a-full a-100 > 10/100BaseTX > > Port Name Status Vlan Duplex Speed > Type > > Fa0/22 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/23 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/24 connected trunk a-full a-100 > 10/100BaseTX > > Gi0/1 disabled 1 auto auto Not > Present > > Gi0/2 disabled 1 auto auto Not > Present > > Po1 connected trunk a-full a-100 > > Po2 connected trunk a-full a-100 > > Po3 connected trunk a-full a-100 > > Cat3#sh spann blo > > Name Blocked Interfaces List > > -------------------- ------------------------------------ > > Number of blocked ports (segments) in the system : 0 > > cat 4 > > Fa0/19 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/20 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/21 connected trunk a-full a-100 > 10/100BaseTX > > Port Name Status Vlan Duplex Speed > Type > > Fa0/22 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/23 connected trunk a-full a-100 > 10/100BaseTX > > Fa0/24 connected trunk a-full a-100 > 10/100BaseTX > > Gi0/1 disabled 1 auto auto Not > Present > > Gi0/2 disabled 1 auto auto Not > Present > > Po1 connected trunk a-full a-100 > > Po2 connected trunk a-full a-100 > > Po3 connected trunk a-full a-100 > > Cat4#sh spann block > > Name Blocked Interfaces List > > -------------------- ------------------------------------ > > VLAN0001 Po1 > > VLAN0010 Po1, Po3 > > VLAN0020 Po1, Po3 > > VLAN0030 Po1, Po3 > > VLAN0040 Po1, Po3 > > VLAN0050 Po1, Po3 > > VLAN0060 Po1, Po3 > > Number of blocked ports (segments) in the system : 13 > > Didn't think spanning-tree would ever affect etherchannel like this, at > least from a blocking sense. I have done other configs where stp put the > port in err-disabled, but none of my ports are errored out as you can see.. > > thx guys. > > Rob Routt > > > > > > ------------------------------------------------------------------------ > > Insert movie times and more without leaving Hotmail®. See how. < > http://windowslive.com/Tutorial/Hotmail/QuickAdd?ocid=TXT_TAGLM_WL_HM_Tutorial_QuickAdd_062009 > > > > -- > // Freedom Matters > // Follow my progress on: http://kpjungle.wordpress.com > > > --
