RE: Multicasting - means what? [7:18232]
I see that Cisco has two terms now for the same thing. The following excerpts are taken from two different Cisco documents, resulting from two different searches, one using the CD mac as the search term, the other using PVST+ as the search term. both documents have recent dates at the bottom. two different camps? what will it take to get one of the other to cross the bridge that divides them? http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/rel6_3/config/e_ trunk.htm watch the wrap When you connect two Cisco switches through 802.1Q trunks, the switches exchange spanning-tree BPDUs on each VLAN allowed on the trunks. The BPDUs on the native VLAN of the trunk are sent untagged to the reserved IEEE 802.1d spanning-tree multicast MAC address (01-80-C2-00-00-00). The BPDUs on all other VLANs on the trunk are sent tagged to the reserved Cisco Shared Spanning Tree (SSTP) multicast MAC address (01-00-0c-cc-cc-cd). http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fswt ch_c/swprt6/xcfvl.htm watch the wrap PVST+ provides support for 802.1Q trunks and the mapping of multiple spanning trees to the single spanning tree of 802.1Q switches. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Daniel Cotts Sent: Sunday, September 02, 2001 10:32 PM To: [EMAIL PROTECTED] Subject: RE: Multicasting - means what? [7:18232] I haven't yet been successful with finding 01-00-0c-ee-ee-ee but I'll tell where I've been. A "show cam system" on a Cat5505 gives that address. Nothing special in the box. Old 3.1(1) code. Also true on newer code. Checked out RSM cards and didn't find anything. Decided that it might be older technology so considered Token Ring, FDDI, and ATM. The only Cisco proprietary item that I found was a Cisco Spanning-Tree Protocol version used in Token Ring CRF implementations. http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/cnfg_nts/token/4 158_02.htm The Cisco STP BPDU format is: Destination Address | Source Address | RIF | SAP | BPDU Replaces bridge group address of destination address field with a Cisco-specific group address to prevent external bridges from analyzing TrCRF BPDUs. http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb2/vlan.htm The Cisco BPDUs use a different multicast destination address (x'800778020200) Which translates to 01-e0-1e-40-40-00 ?? Another list of multicasting addresses is located at: http://www.cavebear.com/CaveBear/Ethernet/multicast.html He does not have the Cisco PVST+ address of 01-00-0c-cc-cc-cd If anyone does find that multicast address please post the solution. > -Original Message- > From: Leigh Anne Chisholm [mailto:[EMAIL PROTECTED]] > Sent: Sunday, September 02, 2001 9:17 PM > To: [EMAIL PROTECTED] > Subject: RE: Multicasting - means what? [7:18232] > > > That happens to be the page I've been looking at--that > generated my query in > the first place. > > I've looked and looked, and can't seem to find a reference for > 01-00-0c-ee-ee-ee either. > > > > > -Original Message- > > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of > > Chuck Larrieu > > Sent: Sunday, September 02, 2001 6:54 PM > > To: [EMAIL PROTECTED] > > Subject: RE: Multicasting - means what? [7:18232] > > > > > > you know, Leigh Anne, I recall seeing a CAM table in one of the > > documents I > > checked while I was researching you question. check out > > > > http://www.cisco.com/warp/public/473/22.html > > > > if you scroll down about half way, and look over the CAM > table. Lo and > > behold, the spanning tree, CGMP, and CDP MACs are there, > appearing in each > > of the vlans. there are a couple of other suspicious > looking MACs there as > > well, but I can find no information referencing them. oh wait. > > Cisco shared > > spanning tree = 01-00-0c-cc-cc-cd > > > > still can't find a reference for 01-00-0c-ee-ee-ee > > > > Chuck > > > > > > -Original Message- > > From: Leigh Anne Chisholm [mailto:[EMAIL PROTECTED]] > > Sent: Saturday, September 01, 2001 1:04 PM > > To: Chuck Larrieu; [EMAIL PROTECTED] > > Subject: RE: Multicasting - means what? [7:18232] > > > > > > Heck no Chuck... I don't mind you bringing it up. I think it's an > > interesting discussion. If you hadn't, and hadn't provided > me with the > > information for me to remember the correct answer, I would > have posted it. > > At any rate... with respect to your public and private emails to me: > > > > When CGMP is enabled on a switch, the switch adds the MAC address > > 01-00-0C-DD-DD-DD to its "cam system"
RE: Multicasting - means what? [7:18232]
I haven't yet been successful with finding 01-00-0c-ee-ee-ee but I'll tell where I've been. A "show cam system" on a Cat5505 gives that address. Nothing special in the box. Old 3.1(1) code. Also true on newer code. Checked out RSM cards and didn't find anything. Decided that it might be older technology so considered Token Ring, FDDI, and ATM. The only Cisco proprietary item that I found was a Cisco Spanning-Tree Protocol version used in Token Ring CRF implementations. http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/cnfg_nts/token/4 158_02.htm The Cisco STP BPDU format is: Destination Address | Source Address | RIF | SAP | BPDU Replaces bridge group address of destination address field with a Cisco-specific group address to prevent external bridges from analyzing TrCRF BPDUs. http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb2/vlan.htm The Cisco BPDUs use a different multicast destination address (x'800778020200) Which translates to 01-e0-1e-40-40-00 ?? Another list of multicasting addresses is located at: http://www.cavebear.com/CaveBear/Ethernet/multicast.html He does not have the Cisco PVST+ address of 01-00-0c-cc-cc-cd If anyone does find that multicast address please post the solution. > -Original Message- > From: Leigh Anne Chisholm [mailto:[EMAIL PROTECTED]] > Sent: Sunday, September 02, 2001 9:17 PM > To: [EMAIL PROTECTED] > Subject: RE: Multicasting - means what? [7:18232] > > > That happens to be the page I've been looking at--that > generated my query in > the first place. > > I've looked and looked, and can't seem to find a reference for > 01-00-0c-ee-ee-ee either. > > > > > -Original Message- > > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of > > Chuck Larrieu > > Sent: Sunday, September 02, 2001 6:54 PM > > To: [EMAIL PROTECTED] > > Subject: RE: Multicasting - means what? [7:18232] > > > > > > you know, Leigh Anne, I recall seeing a CAM table in one of the > > documents I > > checked while I was researching you question. check out > > > > http://www.cisco.com/warp/public/473/22.html > > > > if you scroll down about half way, and look over the CAM > table. Lo and > > behold, the spanning tree, CGMP, and CDP MACs are there, > appearing in each > > of the vlans. there are a couple of other suspicious > looking MACs there as > > well, but I can find no information referencing them. oh wait. > > Cisco shared > > spanning tree = 01-00-0c-cc-cc-cd > > > > still can't find a reference for 01-00-0c-ee-ee-ee > > > > Chuck > > > > > > -Original Message- > > From: Leigh Anne Chisholm [mailto:[EMAIL PROTECTED]] > > Sent: Saturday, September 01, 2001 1:04 PM > > To: Chuck Larrieu; [EMAIL PROTECTED] > > Subject: RE: Multicasting - means what? [7:18232] > > > > > > Heck no Chuck... I don't mind you bringing it up. I think it's an > > interesting discussion. If you hadn't, and hadn't provided > me with the > > information for me to remember the correct answer, I would > have posted it. > > At any rate... with respect to your public and private emails to me: > > > > When CGMP is enabled on a switch, the switch adds the MAC address > > 01-00-0C-DD-DD-DD to its "cam system" table. By default, a > switch only > > listen to multicast addresses in show cam system. I'd expect to > > see the MAC > > multicast address for Spanning Tree to be in there as well as you > > suggested > > in the private email. > > > > I believe that 01 is reserved for all multicast addresses. > It's just that > > 01-00-5E-00-00-00 through 01-00-5E-7F-FF-FF have been > reserved for IP > > multicast translation as you said in a private email to me. > I don't think > > anyone's been playing "fast and loose" with this one. Just you > > and I had a > > blonde moment. > > > > Don't know about the Token Ring address for sure... I've > **GOT** to get > > working on my current project because I'm **WAY** behind. > But if you read > > it right to left, I see the first octet as 01... > > > > > > -- Leigh Anne > > > > > > > -Original Message- > > > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of > > > Chuck Larrieu > > > Sent: Sunday, September 02, 2001 9:48 AM > > > To: [EMAIL PROTECTED] > > > Subject: Multicasting - means what? [7:18232] > > > > > > > > > this post r
RE: Multicasting - means what? [7:18232]
That happens to be the page I've been looking at--that generated my query in the first place. I've looked and looked, and can't seem to find a reference for 01-00-0c-ee-ee-ee either. > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > Chuck Larrieu > Sent: Sunday, September 02, 2001 6:54 PM > To: [EMAIL PROTECTED] > Subject: RE: Multicasting - means what? [7:18232] > > > you know, Leigh Anne, I recall seeing a CAM table in one of the > documents I > checked while I was researching you question. check out > > http://www.cisco.com/warp/public/473/22.html > > if you scroll down about half way, and look over the CAM table. Lo and > behold, the spanning tree, CGMP, and CDP MACs are there, appearing in each > of the vlans. there are a couple of other suspicious looking MACs there as > well, but I can find no information referencing them. oh wait. > Cisco shared > spanning tree = 01-00-0c-cc-cc-cd > > still can't find a reference for 01-00-0c-ee-ee-ee > > Chuck > > > -Original Message- > From: Leigh Anne Chisholm [mailto:[EMAIL PROTECTED]] > Sent: Saturday, September 01, 2001 1:04 PM > To: Chuck Larrieu; [EMAIL PROTECTED] > Subject: RE: Multicasting - means what? [7:18232] > > > Heck no Chuck... I don't mind you bringing it up. I think it's an > interesting discussion. If you hadn't, and hadn't provided me with the > information for me to remember the correct answer, I would have posted it. > At any rate... with respect to your public and private emails to me: > > When CGMP is enabled on a switch, the switch adds the MAC address > 01-00-0C-DD-DD-DD to its "cam system" table. By default, a switch only > listen to multicast addresses in show cam system. I'd expect to > see the MAC > multicast address for Spanning Tree to be in there as well as you > suggested > in the private email. > > I believe that 01 is reserved for all multicast addresses. It's just that > 01-00-5E-00-00-00 through 01-00-5E-7F-FF-FF have been reserved for IP > multicast translation as you said in a private email to me. I don't think > anyone's been playing "fast and loose" with this one. Just you > and I had a > blonde moment. > > Don't know about the Token Ring address for sure... I've **GOT** to get > working on my current project because I'm **WAY** behind. But if you read > it right to left, I see the first octet as 01... > > > -- Leigh Anne > > > > -Original Message- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > > Chuck Larrieu > > Sent: Sunday, September 02, 2001 9:48 AM > > To: [EMAIL PROTECTED] > > Subject: Multicasting - means what? [7:18232] > > > > > > this post results from an off line conversation with someone regarding > > multicasting. The original question follows: > > > > someone said: > > CGMP: Router sends CGMP multicast packets to the switches at a > well known > > multicast MAC address: 01-00-0C-DD-DD-DD. > > > > Now by definition, if all multicast frames have a destination > MAC address > > beginning with "01-00-5E" - how does this address qualify as > multicast? I > > got this from http://www.cisco.com/networkers/nw99_pres/314.pdf a > > networkers presentation. > > > > I've found other documents that reference this MAC address--but is this > > really considered a multicast address? > > end of quote > > > > let's see - unicast is intended for a single destination, broadcast is > > intended for all destinations. does that mean that anything > > intended really > > or potentially for more than one destination, but not all > > destinations, is a > > multicast? > > > > I have the distinct impression that some folks somewhere are > playing a bit > > fast and loose with definitions. Is the spanning tree reserved mac > > 01-80-C2-00-00-00 multicast? it can't be broadcast because it is not > > destined for the FF mac. How about the token ring error > monitor mac of > > 03-00-00-00-00-10 ( this is the ethernet form of the address, > according to > > my source ) > > > > Is CGMP really "multicast"? As opposed, maybe, to an ethernet > > frame placed > > onto the wire ( or issued out all ports ) for a specific > purpose? Cisco's > > own definition of multicast, "Single packets copied by the > > network and sent > > to a specific subset of network addresses" leaves a lot of > wiggle room. is > > Cisco talking about layer
RE: Multicasting - means what? [7:18232]
you know, Leigh Anne, I recall seeing a CAM table in one of the documents I checked while I was researching you question. check out http://www.cisco.com/warp/public/473/22.html if you scroll down about half way, and look over the CAM table. Lo and behold, the spanning tree, CGMP, and CDP MACs are there, appearing in each of the vlans. there are a couple of other suspicious looking MACs there as well, but I can find no information referencing them. oh wait. Cisco shared spanning tree = 01-00-0c-cc-cc-cd still can't find a reference for 01-00-0c-ee-ee-ee Chuck -Original Message- From: Leigh Anne Chisholm [mailto:[EMAIL PROTECTED]] Sent: Saturday, September 01, 2001 1:04 PM To: Chuck Larrieu; [EMAIL PROTECTED] Subject: RE: Multicasting - means what? [7:18232] Heck no Chuck... I don't mind you bringing it up. I think it's an interesting discussion. If you hadn't, and hadn't provided me with the information for me to remember the correct answer, I would have posted it. At any rate... with respect to your public and private emails to me: When CGMP is enabled on a switch, the switch adds the MAC address 01-00-0C-DD-DD-DD to its "cam system" table. By default, a switch only listen to multicast addresses in show cam system. I'd expect to see the MAC multicast address for Spanning Tree to be in there as well as you suggested in the private email. I believe that 01 is reserved for all multicast addresses. It's just that 01-00-5E-00-00-00 through 01-00-5E-7F-FF-FF have been reserved for IP multicast translation as you said in a private email to me. I don't think anyone's been playing "fast and loose" with this one. Just you and I had a blonde moment. Don't know about the Token Ring address for sure... I've **GOT** to get working on my current project because I'm **WAY** behind. But if you read it right to left, I see the first octet as 01... -- Leigh Anne > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > Chuck Larrieu > Sent: Sunday, September 02, 2001 9:48 AM > To: [EMAIL PROTECTED] > Subject: Multicasting - means what? [7:18232] > > > this post results from an off line conversation with someone regarding > multicasting. The original question follows: > > someone said: > CGMP: Router sends CGMP multicast packets to the switches at a well known > multicast MAC address: 01-00-0C-DD-DD-DD. > > Now by definition, if all multicast frames have a destination MAC address > beginning with "01-00-5E" - how does this address qualify as multicast? I > got this from http://www.cisco.com/networkers/nw99_pres/314.pdf a > networkers presentation. > > I've found other documents that reference this MAC address--but is this > really considered a multicast address? > end of quote > > let's see - unicast is intended for a single destination, broadcast is > intended for all destinations. does that mean that anything > intended really > or potentially for more than one destination, but not all > destinations, is a > multicast? > > I have the distinct impression that some folks somewhere are playing a bit > fast and loose with definitions. Is the spanning tree reserved mac > 01-80-C2-00-00-00 multicast? it can't be broadcast because it is not > destined for the FF mac. How about the token ring error monitor mac of > 03-00-00-00-00-10 ( this is the ethernet form of the address, according to > my source ) > > Is CGMP really "multicast"? As opposed, maybe, to an ethernet > frame placed > onto the wire ( or issued out all ports ) for a specific purpose? Cisco's > own definition of multicast, "Single packets copied by the > network and sent > to a specific subset of network addresses" leaves a lot of wiggle room. is > Cisco talking about layer three "network" of layer two "network"? not that > Cisco's definition is necessarily related to industry standard > definitions, > as we all know from the numerous discussions about OSI here. > > Any comment? Are we counting angels again? :-> > > Chuck > P.S. I hope the person who brought this up in private > correspondence doesn't > mind my posting here. I sanitized so as to protect the innocent, so to > speak. that person is a regular groupstudy participant, so will find out > what I have done sooner or later ;-> Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=18263&t=18232 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Multicasting - means what? [7:18232]
Heck no Chuck... I don't mind you bringing it up. I think it's an interesting discussion. If you hadn't, and hadn't provided me with the information for me to remember the correct answer, I would have posted it. At any rate... with respect to your public and private emails to me: When CGMP is enabled on a switch, the switch adds the MAC address 01-00-0C-DD-DD-DD to its "cam system" table. By default, a switch only listen to multicast addresses in show cam system. I'd expect to see the MAC multicast address for Spanning Tree to be in there as well as you suggested in the private email. I believe that 01 is reserved for all multicast addresses. It's just that 01-00-5E-00-00-00 through 01-00-5E-7F-FF-FF have been reserved for IP multicast translation as you said in a private email to me. I don't think anyone's been playing "fast and loose" with this one. Just you and I had a blonde moment. Don't know about the Token Ring address for sure... I've **GOT** to get working on my current project because I'm **WAY** behind. But if you read it right to left, I see the first octet as 01... -- Leigh Anne > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > Chuck Larrieu > Sent: Sunday, September 02, 2001 9:48 AM > To: [EMAIL PROTECTED] > Subject: Multicasting - means what? [7:18232] > > > this post results from an off line conversation with someone regarding > multicasting. The original question follows: > > someone said: > CGMP: Router sends CGMP multicast packets to the switches at a well known > multicast MAC address: 01-00-0C-DD-DD-DD. > > Now by definition, if all multicast frames have a destination MAC address > beginning with "01-00-5E" - how does this address qualify as multicast? I > got this from http://www.cisco.com/networkers/nw99_pres/314.pdf a > networkers presentation. > > I've found other documents that reference this MAC address--but is this > really considered a multicast address? > end of quote > > let's see - unicast is intended for a single destination, broadcast is > intended for all destinations. does that mean that anything > intended really > or potentially for more than one destination, but not all > destinations, is a > multicast? > > I have the distinct impression that some folks somewhere are playing a bit > fast and loose with definitions. Is the spanning tree reserved mac > 01-80-C2-00-00-00 multicast? it can't be broadcast because it is not > destined for the FF mac. How about the token ring error monitor mac of > 03-00-00-00-00-10 ( this is the ethernet form of the address, according to > my source ) > > Is CGMP really "multicast"? As opposed, maybe, to an ethernet > frame placed > onto the wire ( or issued out all ports ) for a specific purpose? Cisco's > own definition of multicast, "Single packets copied by the > network and sent > to a specific subset of network addresses" leaves a lot of wiggle room. is > Cisco talking about layer three "network" of layer two "network"? not that > Cisco's definition is necessarily related to industry standard > definitions, > as we all know from the numerous discussions about OSI here. > > Any comment? Are we counting angels again? :-> > > Chuck > P.S. I hope the person who brought this up in private > correspondence doesn't > mind my posting here. I sanitized so as to protect the innocent, so to > speak. that person is a regular groupstudy participant, so will find out > what I have done sooner or later ;-> Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=18248&t=18232 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
