Hi Mark: A few notes for you. I didn't catch the original posts as I've been out of the office a lot lately.
1) g.711 with 30ms sample sizes on ethernet consumes 84.8 kbps in each direction. If you use the more common 20ms sample size its 95.2 kbps. I do most of my calculations using www.bandcalc.com 2) If you use one of Cisco's WIC-1ADSL cards in the WIC slot of your 2600 for the DSL modem instead of an Ethernet port and external modem, the resulting ATM interface does get advised by the card of the actual sync rates so the bandwidth capacities that appear on the "show interface" command are accurate, and hence you can build your QoS policies around them. 3) In a simple scenario like yours where you have only one inside interface and only one outside interface it works just fine when you apply your policy to the inside interface. If you ever get into a situation where you have more interfaces (inside or outside) you will have to adjust this. If possible, its always best to apply the policies to outside interfaces. If you haven't seen the following document, check it out it may help explain some stuff for you. http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800b2d29.shtml Regards, Bill > -----Original Message----- > From: Mark Brown [mailto:[email protected]] > Sent: Friday, August 06, 2010 12:34 AM > To: [email protected] > Subject: Re: [on-asterisk] IAX2 prioritize on Cisco IOS - External > Modem - PPPoE - ADSL > > Hey Dave - Thanks! > > I've learned a bit from my personal experience configuring this setup. > I'll reply to my own thread. Hopefully it can help some other folks. > > Some definitions: > > Downstream: Traffic to me, from my ISP > Upstream: Traffic from me, to my ISP > E0/0: Internal (Protected Net) > E0/1: External (PPPoE) to external ADSL Modem > > Lessons learned: > > 1. It has been said before, and I'll second the motion - don't bother > trying to shape inbound traffic. By the time you have the traffic - > it's too late. Resolution to this, try not to over-subscribe your > inbound bandwidth. > > 2. I didn't have much success with "policy maps". I -think- the reason > for this is there is actually no bandwidth capacity assigned to a > dialer > interface, hence there is no way to guarantee a reservation of the > total capacity. (maybe a cisco geek can confirm). > > 3. The only QoS settings that I actually used were "traffic policing". > My internet connection upstream bandwidth is about .67 Mb/s (or > ~686Kb/s) on my adsl circuit. According to Voip-Info.org > http://www.voip-info.org/wiki/view/ITU+G.711 , g711u is approximately > 84Kb/s (I think this is about 42Kb/s in each direction). I wanted to > reserve enough bandwidth for two g711u upstream calls to my VoIP > provider, so I reserved about 90Kb/s. I used the following police and > access-lists. You will notice I have applied this to E0/0, and not > E0/1 > (or the Dialer1 interface). I need to revisit this at some point and > see it I can apply it to the Dialer1 interface. My access-list rule is > pretty crude, but IAX2 (and sometimes SIP) are the only UDP flows that > are really worth mentioning that pass through my router, excluding DNS > which is really pretty lightweight for the most part. I wanted to do > an > initial setup with minimal rules, and do the fine tuning from there. > > policy-map tcppolice > class acgroup110 > police 588000 2000 4000 conform-action transmit exceed-action > set-qos-transmit 4 violate-action drop > > interface Ethernet0/0 > description LAN > ip address 192.168.0.1 255.255.255.0 > ip nat inside > service-policy input tcppolice > > access-list 110 permit tcp any any > > There may be more efficient ways to do this, but at this point, I am > completely happy with the QoS configuration on the Cisco 2600. > > If anyone has any other suggestions or ideas, I'd love to hear about > them too. > > /M > > > On 8/5/2010 5:11 PM, Dave Donovan wrote: > > Hi Mark, > > > > I thought I'd give your thread a bump. Did you get a response on > > this, it looks like a good question. > > > > I wonder if Lloyd or any of our other Cisco wizards are tuned in and > > might be able to shed some light on the subject. > > > > Dave > > > > > > > > On Sat, Jul 31, 2010 at 6:19 PM, Mark Brown<[email protected]> > wrote: > >> Hi Taugers! > >> > >> I'm a bit of a cisco newb, and I was wondering if someone here could > smack > >> me around with a cisco clue stick :-) > >> > >> I'm in the midst of trying to prioritize my IAX2 connections, and > have the > >> rest of my connections do fair-queue. > >> > >> I found the following on http://www.voip- > info.org/wiki/view/QoS+Cisco > >> (below). This is for the use-case with a ADSL WIC installed. > (hence the ATM > >> interface in the example) > >> > >> I am connecting a ADSL modem to a Cisco 2611, and running a PPPoE > client on > >> the route which is similar, however I'm not sure where to apply the > outbound > >> service-policy. > >> > >> I figure it doesn't make sense to connect it to int eth 0/1, which > is PPPoE > >> to the modem. I don't think it makes sense to apply it to the > Dialer1 > >> interface. > >> > >> Virtual-Access, Virtual-Template - can someone clear some confusion > for me > >> please - thanks! > >> > >> I'm using IOS 12.3(26). > >> > >> /Mark > >> ------- > >> > >> class-map match-any signaling > >> > >> match access-group 102 > >> class-map match-any voice > >> match access-group 101 > >> > >> policy-map VoicePolicy > >> class voice > >> priority 384 > >> class signaling > >> priority 128 > >> class class-default > >> fair-queue > >> > >> interface ATM0/0/0 > >> no ip address > >> no atm ilmi-keepalive > >> bundle-enable > >> dsl operating-mode auto > >> pvc 0/35 > >> vbr-nrt 768 768 > >> tx-ring-limit 3 > >> service-policy output VoicePolicy > >> pppoe-client dial-pool-number 1 > >> > >> interface Dialer0 > >> ip unnumbered FastEthernet0/0 > >> no ip redirects > >> no ip unreachables > >> ip mtu 1492 > >> encapsulation ppp > >> no ip route-cache cef > >> no ip route-cache > >> ip tcp adjust-mss 1452 > >> no ip mroute-cache > >> dialer pool 1 > >> no cdp enable > >> ppp authentication pap chap callin > >> ppp pap sent-username<your PPPoE Username> password 0<Your > >> PPPoE Password> > >> > >> access-list 101 remark ***QoS for RTP and IAX*** > >> access-list 101 permit udp any any dscp ef > >> access-list 102 remark ***QOS for SIP*** > >> access-list 102 permit udp any any dscp af41 > >> > >> > >> > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [email protected] > > For additional commands, e-mail: [email protected] > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
