07-09-2007 08:04 AM - edited 03-03-2019 05:46 PM
Hi
We ahve a 15 MB internet connection used for internet as well as for VPN users. I want to reserve 5 MB for the VPN concentrator so that our site to site VPN / VPN clients get atleast 5 MB.
I have configured a class map statement to match ipsec and PPTP (we have some windows clients). On the policy map, I have defined the class and assigned bandwidth 5000 statement.
I applied the service polciy statement on the serial interface. I have attached the output of my sh interface ser1/0 and sh policy-map int ser1/0.
#sh int ser1/0
Serial1/0 is up, line protocol is up
Hardware is DSXPNM Serial
Internet address is x.x.x.x/30
MTU 4470 bytes, BW 15338 Kbit, DLY 200 usec,
reliability 255/255, txload 140/255, rxload 247/255
Encapsulation PPP, LCP Open
Listen: CDPCP
Open: IPCP, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:08, output hang never
Last clearing of "show interface" counters 00:17:57
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1385
Queueing strategy: Class-based queueing
Output queue: 0/1000/64/1385 (size/max total/threshold/drops)
Conversations 0/66/256 (active/max active/max total)
Reserved Conversations 1/1 (allocated/max allocated)
Available Bandwidth 6503 kilobits/sec
5 minute input rate 14881000 bits/sec, 2668 packets/sec
5 minute output rate 8474000 bits/sec, 2265 packets/sec
2879169 packets input, 1965574028 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
2482980 packets output, 1178489110 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DSU mode 0, bandwidth 15300, real bandwidth 15338, scramble 0
ICF-FRX2851#sh policy-map int ser1/0
Serial1/0
Service-policy output: VPNPriority
Class-map: VPN (match-any)
555364 packets, 301398490 bytes
5 minute offered rate 1135000 bps, drop rate 0 bps
Match: protocol ipsec
554104 packets, 301331404 bytes
5 minute rate 1134000 bps
Match: protocol pptp
1260 packets, 67086 bytes
5 minute rate 0 bps
Queueing
Output Queue: Conversation 265
Bandwidth 5000 (kbps) Max Threshold 64 (packets)
(pkts matched/bytes matched) 106511/76482141
(depth/total drops/no-buffer drops) 0/0/0
Class-map: class-default (match-any)
2246589 packets, 841337005 bytes
5 minute offered rate 4565000 bps, drop rate 0 bps
Match: any
Can someone explain, why it shows the available bandwidth at 6502 kilobits/sec. I was hoping to see at least 10000 kilobits available.
Thanks
Kumar
07-09-2007 08:46 AM
Hi,
the available bandwidth is calculated like this:
AvailBW = (interface bandwidth)*max-reservable-bandwidth - allocatedBW
where max-reservable-bandwidth=0.75 by default and allocatedBW=sum(allocated BW of all classes)
In your case this means:
AvailBW = 15338*0.75 - 5000 = 6503
AvailBW is the bandwidth you could allocate in your service-policy to additional classes or increase bandwidth for existing classes.
Hope this helps!
Regards, Martin
07-09-2007 08:49 AM
Thanks and that makes sense now.
Kumar
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