Hm. Then Cisco needs to update their documentation :-). I stand corrected. I doubt they are random numbers.
What device was this on? -- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert YES! We include 400 hours of REAL rack time with our Blended Learning Solution! Mailto: [email protected] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Web: http://www.ipexpert.com/ On Sun, Jun 27, 2010 at 11:14, Atle Ørn Hardarson <[email protected]> wrote: > Actually, Marko - I don't think so - I checked that very same port out: > Switch#show snmp mib ifmib ifindex Po1 > Interface = Port-channel1, Ifindex = 218 > Switch#show spanning-tree interface po1 detail > Port 1665 (Port-channel1) of VLAN0001 is designated forwarding > (...) > It's SNMP ifindex is 218, but it's "STP ID" is 1665 - so to me it appears > that it is some kind of separate identifier exclusive to STP... > Btw, your audio lessons are great and very helpful, I listen to them every > day as a part of the BLS. > Atle > > On Wed, Jun 23, 2010 at 4:43 PM, Marko Milivojevic <[email protected]> > wrote: >> >> Just one minor correction on Tyson's response. Port ID used by STP is >> derived from SNMP ifindex for that port. >> >> -- >> Marko Milivojevic - CCIE #18427 >> Senior Technical Instructor - IPexpert >> >> YES! We include 400 hours of REAL rack >> time with our Blended Learning Solution! >> >> Mailto: [email protected] >> Telephone: +1.810.326.1444 >> Fax: +1.810.454.0130 >> Web: http://www.ipexpert.com/ >> >> On Wed, Jun 23, 2010 at 14:39, Tyson Scott <[email protected]> wrote: >> > 1 Yes >> > >> > 2 Yes >> > >> > 3 Total Accumulated Path Cost to the root Bridge >> > >> > 4. The number of times SPT has been recalculated on the Path >> > >> > 5. A port set to mode dynamic desirable will default to access mode if >> > no >> > device negotiates on the remote end yet it is still the recommendation >> > to >> > set the mode to access when you know it is connected to end devices. >> > >> > >> > >> > HTH >> > >> > >> > >> > Regards, >> > >> > >> > >> > Tyson Scott - CCIE #13513 R&S, Security, and SP >> > >> > Managing Partner / Sr. Instructor - IPexpert, Inc. >> > >> > Mailto: [email protected] >> > >> > Telephone: +1.810.326.1444, ext. 208 >> > >> > Live Assistance, Please visit: www.ipexpert.com/chat >> > >> > eFax: +1.810.454.0130 >> > >> > >> > >> > IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, >> > Audio Tools, Online Hardware Rental and Classroom Training for the Cisco >> > CCIE (R&S, Voice, Security & Service Provider) certification(s) with >> > training locations throughout the United States, Europe, South Asia and >> > Australia. Be sure to visit our online communities at >> > www.ipexpert.com/communities and our public website at www.ipexpert.com >> > >> > >> > >> > From: [email protected] >> > [mailto:[email protected]] On Behalf Of Atle Ørn >> > Hardarson >> > Sent: Wednesday, June 23, 2010 5:21 AM >> > To: [email protected] >> > Subject: [OSL | CCIE_RS] show spanning-tree int xx detail >> > >> > >> > >> > Hi everyone >> > >> > >> > >> > Can someone please explain to me so that I understand the following >> > output >> > better: >> > >> > >> > >> > switch# show spanning-tree interface Po1 detail >> > >> > >> > >> > Port 1665 (Port-channel1) of VLAN0001 is designated forwarding >> > >> > Port path cost 3, Port priority 128, Port Identifier 128.1665. >> > >> > Designated root has priority 24577, address 0009.12e9.aec0 >> > >> > Designated bridge has priority 32769, address 0014.f113.fc00 >> > >> > Designated port id is 128.1665, designated path cost 10 >> > >> > Timers: message age 0, forward delay 0, hold 0 >> > >> > Number of transitions to forwarding state: 16 >> > >> > Link type is point-to-point by default >> > >> > BPDU: sent 9090982, received 2782 >> > >> > >> > >> > >> > >> > Please find the breakdown of my questions below: >> > >> > >> > >> > "Port 1665 (Port-channel1) of VLAN0001 is designated forwarding" >> > >> > *** Where does the switch get the value of "Port 1665" from? Is this an >> > STP >> > internal identifier of the port? >> > >> > >> > >> > "Port path cost 3, Port priority 128, Port Identifier 128.1665." >> > >> > *** The port path cost and port priority shown here are LOCAL values, am >> > I >> > correct in this assumption? There are no cumulative values represented >> > here. >> > >> > >> > >> > "Designated port id is 128.1665, designated path cost 10" >> > >> > *** The designated port ID is the REMOTE value sent from the neighboring >> > switch, but *what* is the "designated path cost" and how is it >> > calculated? >> > >> > *** Is the designated path cost the same as the "root path cost"? >> > >> > >> > >> > "Number of transitions to forwarding state: 16" >> > >> > *** What exactly does this mean? I used to think that this number >> > represented the classic STP states, but a value of 16 has me confused. >> > What >> > states are they referring to here? >> > >> > >> > >> > "Link type is point-to-point by default" >> > >> > *** In Cisco's CCIE official study guide, it is recommended that a port >> > channel is configured with the "spanning-tree link-type point-to-point" >> > command, in order to facilitate a quick connection, but is it really >> > necessary to hard-code this command on the interface, as it is obviously >> > the >> > default link-type on etherchannel? A bit confusing >> > >> > >> > >> > Thanks! >> > >> > >> > >> > Atle >> > >> > _______________________________________________ >> > For more information regarding industry leading CCIE Lab training, >> > please >> > visit www.ipexpert.com >> > >> > > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
