Just remember that changing the interface bandwidth affects routing metrics as well, use carefully. :)
Ken Matlock Network Analyst Exempla Healthcare (303) 467-4671 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Di Bias, Steve Sent: Wednesday, August 31, 2011 10:10 AM To: Di Bias, Steve; marc abel Cc: [email protected] Subject: Re: [OSL | CCIE_RS] ip rsvp bandwidth Here is a snippet from Cisco for you: Reserve Bandwidth with RSVP Admission of Resource Reservation Protocol (RSVP) flow is bounded by the ip rsvp bandwidth command that uses the maximum reserveable bandwidth, which is a function of the available WFQ bandwidth. Thus, the use of the max-reserved-bandwidth command in order to configure a value higher than the historic default of 75 percent makes more bandwidth available to RSVP. But the RSVP configuration still limits you to 75 percent for RSVP calls. As a workaround, use the bandwidth command in order to increase the interface bandwidth, apply the max-reserved-bandwidth command, and then reapply or reconfigure the ip RSVP bandwidth command. In other words, artificially inflate the interface bandwidth as seen by the Cisco IOS software processes. Thank you, Steve Di Bias Network Engineer - Information Systems Valley Health System - Las Vegas Office - 702- 369-7594 Cell - 702-241-1801 [email protected] -----Original Message----- From: Di Bias, Steve Sent: Wednesday, August 31, 2011 9:03 AM To: 'marc abel' Cc: [email protected] Subject: RE: [OSL | CCIE_RS] ip rsvp bandwidth You're correct, after a little research I have found that the max-reserved-bandwidth doesn't apply to RSVP, so that being said you will need to set your interface bandwidth to something higher than 1544 Try: interface Serial0/2/0 bandwidth 2058 Thank you, Steve Di Bias Network Engineer - Information Systems Valley Health System - Las Vegas Office - 702- 369-7594 Cell - 702-241-1801 [email protected] -----Original Message----- From: marc abel [mailto:[email protected]] Sent: Wednesday, August 31, 2011 8:59 AM To: Di Bias, Steve Cc: [email protected] Subject: Re: [OSL | CCIE_RS] ip rsvp bandwidth That doesn't appear to help: R5(config-if)#do show run int s0/2/0 Building configuration... Current configuration : 131 bytes ! interface Serial0/2/0 bandwidth 1544 ip address 150.100.25.5 255.255.255.0 encapsulation ppp max-reserved-bandwidth 100 end R5(config-if)#ip rsvp band 1544 RSVP bandwidth (which is the bandwidth for the IP headers and data inside them, but not the required link layer headers) exceeds 75% of interface bandwidth. It may be that you need to enter the 'bandwidth' command to correct the system's understanding of the available bandwidth. If that's not the case, then: Due to bit-stuffing, layer 2 headers and layer 1 framing, and the need for routing and keep-alive traffic, not to mention the RSVP messages themselves, this is just plain too high. Configure your interface realistically for the bandwidth available. On Wed, Aug 31, 2011 at 10:49 AM, Di Bias, Steve <[email protected]> wrote: > Good question, have you tried changing the reservable bandwidth to something > higher than 75? > > CH-Dist-2(config)#int gig3/1 > CH-Dist-2(config-if)#max-reserved-bandwidth ? > <1-100> Max. reservable bandwidth as % of interface bandwidth > > Thank you, > > Steve Di Bias > Network Engineer - Information Systems > Valley Health System - Las Vegas > Office - 702- 369-7594 > Cell - 702-241-1801 > [email protected] > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of marc abel > Sent: Wednesday, August 31, 2011 7:36 AM > To: [email protected] > Subject: [OSL | CCIE_RS] ip rsvp bandwidth > > I was working on Vol 1 lab 21 on a task dealing with RSVP and over > subscription. > > On R2 I had no problems > > interface Serial0/2/0 > description Serial Link to R5 > bandwidth 1500 > ip address 150.100.25.2 255.255.255.0 > encapsulation ppp > fair-queue 64 256 36 > clock rate 2000000 > ip rsvp bandwidth 3000 > end > > On R5 though I get this: > > interface Serial0/2/0 > bandwidth 3088 > ip address 150.100.25.5 255.255.255.0 > encapsulation ppp > end > > R5(config-if)#ip rsvp bandwidth 3088 > > RSVP bandwidth (which is the bandwidth for the IP > headers and data inside them, but not the required > link layer headers) exceeds 75% of interface bandwidth. > It may be that you need to enter the 'bandwidth' > command to correct the system's understanding of the > available bandwidth. If that's not the case, then: > Due to bit-stuffing, layer 2 headers and layer 1 > framing, and the need for routing and keep-alive > traffic, not to mention the RSVP messages themselves, > this is just plain too high. Configure your interface > realistically for the bandwidth available. > > It will only allow me to reserve 75% of the bandwidth configured no matter > what. > > I assume this is due to IOS version differences? > > R5(config-if)#do show ver > Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9-M), Version > 12.4(15)T12, RELEASE SOFTWARE (fc3) > > R2(config-if)#do show ver > Cisco IOS Software, 3800 Software (C3825-ADVENTERPRISEK9-M), Version > 12.4(24)T2, > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? 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