Yeah of course you can have more than one L2 router in an area, didn't think of it :)
About the 10base5 segment, that was limited in length to 500 meters. Transceivers must be at least 2.5 meters apart, hence the 200 nodes. This was before a DELNI was invented. If my failing memory doesn't fail me that 200 node limit remained the same with Delni's.
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Origineel bericht
Van: Johnny Billquist
Verzonden: zaterdag 28 februari 2015 20:55
Aan: hecnet at Update.UU.SE
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] Maximum number of L2 routers?
On 2015-02-28 20:51, Hans Vlems wrote:
64:-)?
You can definitely have more than one L2 router per area... :-)
I don't know for sure, as you probably have guessed...
There is an ncp executor parameter called maximum broadcast routers, default value 32 iirc.
Is there an architectural limit, depends on what you mean by ethernet segment. A 10base5 segment was limited to 200 nodes. 64 L2 routers might put a hefty broadcast load on it. On an extended ethernet LAN there is likely no technical limit.
Really? I have some vague memory of some limit of an ethernet segment,
but I can't recall any details now. Why 200?
Johnny
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Origineel bericht
Van: Jordi Guillaumes i Pons
Verzonden: zaterdag 28 februari 2015 20:37
Aan: HECnet Mailing List
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: [HECnet] Maximum number of L2 routers?
Hello, list,
I'm trying to remember what is the maximum number of area routers allowed in a DECNET Phase IV ethernet segment. Anyone of you have that information at hand?
On other news, the old macbook I was using as home server has died, after years of service beyond the call of duty. I'm setting up my stuff using several smallish ARM computers. To be specific, now I'm running a cubietruck and and Odroid-C1 (and a raspberry Pi as router/firewall). I'm having trouble with the net connectivity, so some yo-yo disconnects from area 7 should be expected. Not so hard as last sunday, but I'm still doing quite a lot of reboots.
BTW, the SG1 multinet link seems to be down again (unless it is a problem in my side, which is completely possible).
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
El 28/02/2015, a les 20:55, Johnny Billquist <bqt at softjar.se> va escriure:
On 2015-02-28 20:51, Hans Vlems wrote:
64:-)?
You can definitely have more than one L2 router per area... :-)
I don't know for sure, as you probably have guessed...
There is an ncp executor parameter called maximum broadcast routers, default value 32 iirc.
Is there an architectural limit, depends on what you mean by ethernet segment. A 10base5 segment was limited to 200 nodes. 64 L2 routers might put a hefty broadcast load on it. On an extended ethernet LAN there is likely no technical limit.
Really? I have some vague memory of some limit of an ethernet segment, but I can't recall any details now. Why 200?
Got it. The (virtual) Big Orange Wall comes to the rescue:
3.7.3.1 Maximum Number of Routers and End Nodes Allowed
Certain NCP command parameter values limit the number of routers and end nodes that can be configured on broadcast circuits.
Use the SET CIRCUIT command with the MAXIMUM ROUTERS parameter to set the maximum number of routers permitted on a particular Ethernet or FDDI circuit. The largest number of routers allowed on a LAN is 33, which is the default value of the MAXIMUM ROUTERS parameter. Note that the recommended limit on the number of routers on a single broadcast circuit is 10, because of the control traffic overhead (routing messages and system identification messages) involved. For example, the following command specifies that no more than five routers can exist on Ethernet circuit SVA-0:
NCP>SET CIRCUIT SVA-0 MAXIMUM ROUTERS 5
Use the SET EXECUTOR command with the MAXIMUM BROADCAST ROUTERS parameter to specify the maximum number of routing nodes that will be permitted on all Ethernet and FDDI circuits to which the local node is attached.
So it is a global maximum, for both L1 and L2 routers.
On 2015-02-28 20:51, Hans Vlems wrote:
64:-)?
You can definitely have more than one L2 router per area... :-)
I don't know for sure, as you probably have guessed...
There is an ncp executor parameter called maximum broadcast routers, default value 32 iirc.
Is there an architectural limit, depends on what you mean by ethernet segment. A 10base5 segment was limited to 200 nodes. 64 L2 routers might put a hefty broadcast load on it. On an extended ethernet LAN there is likely no technical limit.
Really? I have some vague memory of some limit of an ethernet segment, but I can't recall any details now. Why 200?
Johnny
Verzonden vanaf mijn BlackBerry 10-smartphone.
Origineel bericht
Van: Jordi Guillaumes i Pons
Verzonden: zaterdag 28 februari 2015 20:37
Aan: HECnet Mailing List
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: [HECnet] Maximum number of L2 routers?
Hello, list,
I'm trying to remember what is the maximum number of area routers allowed in a DECNET Phase IV ethernet segment. Anyone of you have that information at hand?
On other news, the old macbook I was using as home server has died, after years of service beyond the call of duty. I'm setting up my stuff using several smallish ARM computers. To be specific, now I'm running a cubietruck and and Odroid-C1 (and a raspberry Pi as router/firewall). I'm having trouble with the net connectivity, so some yo-yo disconnects from area 7 should be expected. Not so hard as last sunday, but I'm still doing quite a lot of reboots.
BTW, the SG1 multinet link seems to be down again (unless it is a problem in my side, which is completely possible).
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
64:-)?
I don't know for sure, as you probably have guessed...
There is an ncp executor parameter called maximum broadcast routers, default value 32 iirc.
Is there an architectural limit, depends on what you mean by ethernet segment. A 10base5 segment was limited to 200 nodes. 64 L2 routers might put a hefty broadcast load on it. On an extended ethernet LAN there is likely no technical limit.
Verzonden vanaf mijn BlackBerry 10-smartphone.
Origineel bericht
Van: Jordi Guillaumes i Pons
Verzonden: zaterdag 28 februari 2015 20:37
Aan: HECnet Mailing List
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: [HECnet] Maximum number of L2 routers?
Hello, list,
I'm trying to remember what is the maximum number of area routers allowed in a DECNET Phase IV ethernet segment. Anyone of you have that information at hand?
On other news, the old macbook I was using as home server has died, after years of service beyond the call of duty. I'm setting up my stuff using several smallish ARM computers. To be specific, now I'm running a cubietruck and and Odroid-C1 (and a raspberry Pi as router/firewall). I'm having trouble with the net connectivity, so some yo-yo disconnects from area 7 should be expected. Not so hard as last sunday, but I'm still doing quite a lot of reboots.
BTW, the SG1 multinet link seems to be down again (unless it is a problem in my side, which is completely possible).
On 2015-02-28 20:37, Jordi Guillaumes i Pons wrote:
Hello, list,
I'm trying to remember what is the maximum number of area routers allowed in a DECNET Phase IV ethernet segment. Anyone of you have that information at hand?
Not aware of a hard limit, but there is a configurable limit on the host. Trying to recall details, but right now I can only spot a maximum routers parameter, which would imply that there is no difference between L1 and L2 routers.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
Hello, list,
I'm trying to remember what is the maximum number of area routers allowed in a DECNET Phase IV ethernet segment. Anyone of you have that information at hand?
On other news, the old macbook I was using as home server has died, after years of service beyond the call of duty. I'm setting up my stuff using several smallish ARM computers. To be specific, now I'm running a cubietruck and and Odroid-C1 (and a raspberry Pi as router/firewall). I'm having trouble with the net connectivity, so some yo-yo disconnects from area 7 should be expected. Not so hard as last sunday, but I'm still doing quite a lot of reboots.
BTW, the SG1 multinet link seems to be down again (unless it is a problem in my side, which is completely possible).
On Sat, 14 Feb 2015, Cory Smelosky wrote:
On Sat, 14 Feb 2015, Cory Smelosky wrote:
Peter,
I have the drive imaged. Would you like me to send you a copy so you can help out? You know more about the disk structure than I do.
Still fighting with tape drive, though...
https://gewt.net/compuserve.img.gz
Had a chance to poke at this?
I've confirmed it can be imaged back to another drive. I also identified the grounding issue...it involves the harddrive of all things for some reason.
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects
On Sat, 14 Feb 2015, Cory Smelosky wrote:
On Sat, 14 Feb 2015, Cory Smelosky wrote:
Peter,
I have the drive imaged. Would you like me to send you a copy so you can help out? You know more about the disk structure than I do.
Still fighting with tape drive, though...
https://gewt.net/compuserve.img.gz
Drive either needs cleaned (need to find my cleaning tape) or it's shot. Wouldn't surprise me.
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects
On Sat, 14 Feb 2015, Cory Smelosky wrote:
Peter,
I have the drive imaged. Would you like me to send you a copy so you can help out? You know more about the disk structure than I do.
Still fighting with tape drive, though...
https://gewt.net/compuserve.img.gz
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects
