| Title: | Digital Brouters Conference |
| Notice: | New common-code brouter family: RouteAbout, DECswitch 900 |
| Moderator: | MARVIN::HART LL |
| Created: | Mon Jul 17 1995 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 929 |
| Total number of notes: | 3736 |
Hello, NTT, the Japanese largest communication service provider, provides low cost frame relay service. Restriction of this frame relay service is 'CIR=0'. However the lowest value of CIR on RouteAbout is 300. We could not set CIR to 0. Would anyone please comment for how should we setup the RouteAbout for this service. Thanks in advance. K.Nakano
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 845.1 | MARVIN::TURNER | Neil Turner IPEG REO, 830-4140 | Thu Apr 10 1997 04:30 | 24 | |
The RouteAbout will not actually let you configure a CIR value of zero since this would mean that it could never actually transmit a packet... CIR=0 services are difficult to understand because they provide no committed bandwidth at all. So in theory at least on any given day you may get no packets through the network at all! In practice however you must be able to get some data over the connection for it to be useful. But I suspect the effective CIR over the connection may fluctuate widely from day to day based on the general load in the FR network. (Do NTT quote any figures for the likely achievable transmission speed over a typical CIR=0 PVC...I suspect not?) Anyway I would recommend that you configure the CIR in the router to be the minimum possible (300) and also make sure you configure the LINE-SPEED on the frame relay interface to the actual line speed of the access connection. Configuring it this way means that the RouteAbout will steadily increase its transmission speed from 300 up to the line speed provided it does not receive BECN's from the network. The speed is then reduced when BECNs are received. Hence, over time the actual transmission speed of the router should 'settle' to approximately what is available at any given time. Neil | |||||
| 845.2 | MARVIN::CLEVELAND | Thu Apr 10 1997 07:30 | 5 | ||
BTW, MCI offerred us this service in the US as well, so it is a fairly
common configuration, I think. With zero CIR they gave a much cheaper
per-packet price.
Tim
| |||||