09-06-2007 02:13 PM - edited 03-03-2019 06:38 PM
i want to test the effect of limiting our email (exchange) traffic to a certain amount of bandwidth to allow for a better flow of voip traffic. i currently have qos in place but i still have some voice issues . i know our qos policy is working but i need to tone down email. i think it's b/c we pass a ton of email traffic through 3 t-1's along with voice traffic.
so i was thinking of creating an acl for email then giving it some where around 300 - 500 k per t-1 and adding it to the current qos config.
class-map match-all voice-signaling
match ip dscp af31
class-map match-any voice-traffic
match ip dscp ef
match ip rtp 16384 16383
!
!
policy-map EWT_SP
class voice-traffic
priority 800
class voice-signaling
bandwidth 8
class class-default
fair-queue
sh policy-map EWT_SP
Policy Map EWT_SP
Class voice-traffic
Strict Priority
Bandwidth 1042 (kbps) Burst 26050 (Bytes)
Class voice-signaling
Bandwidth 8 (kbps) Max Threshold 64 (packets)
Class class-default
Flow based Fair Queueing
Bandwidth 0 (kbps) Max Threshold 64 (packets)
EWT_NOC#sh policy-map int ser4/0:0
Serial4/0:0
Service-policy output: EWT_SP
Class-map: voice-traffic (match-any)
2148676 packets, 136995992 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: ip dscp ef (46)
967403 packets, 61480518 bytes
30 second rate 0 bps
Match: ip rtp 16384 16383
1181273 packets, 75515474 bytes
30 second rate 0 bps
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 1042 (kbps) Burst 26050 (Bytes)
(pkts matched/bytes matched) 772408/19968407
(total drops/bytes drops) 0/0
Class-map: voice-signaling (match-all)
2604 packets, 320684 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: ip dscp af31 (26)
Queueing
Output Queue: Conversation 265
Bandwidth 8 (kbps) Max Threshold 64 (packets)
(pkts matched/bytes matched) 2604/320684
(depth/total drops/no-buffer drops) 0/0/0
Class-map: class-default (match-any)
70045641 packets, 16140010608 bytes
30 second offered rate 414000 bps, drop rate 8000 bps
Match: any
Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 256
(total queued/total drops/no-buffer drops) 25/21976/0
09-06-2007 04:46 PM
Depending on IOS version, you would define a class for you e-mail and activate a shaper or policier.
PS:
Seeing
30 second offered rate 414000 bps, drop rate 8000 bps
and
(total queued/total drops/no-buffer drops) 25/21976/0
while other class rate show zero rates, how much bandwidth is available on this link?
If the link's full bandwidth is small enough, your solution might be via LFI.
09-07-2007 07:53 AM
while other class rate show zero rates, how much bandwidth is available on this link? this is a HDLC t-1.
If the link's full bandwidth is small enough, your solution might be via LFI. the circuit is a full t-1.
i'll look into shaping.
thanks.
09-07-2007 09:17 AM
Ok, for a full T-1, you shouldn't need LFI.
Unless you didn't post parts of your outbound policy stats, the stats seem off for a full T. Have you seen the interface's stats hit about 1.5 Mbps?
09-07-2007 09:27 AM
if you mean do the ser int peak at nearly 100% - yes it can some times. i included the " sh policy-map int ser4/0:0" and sh in ser4/0:0.
EWT_NOC#sh policy-map int ser4/0:0
Serial4/0:0
Service-policy output: EWT_SP
Class-map: voice-traffic (match-any)
2242510 packets, 142964898 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: ip dscp ef (46)
981198 packets, 62335478 bytes
30 second rate 0 bps
Match: ip rtp 16384 16383
1261312 packets, 80629420 bytes
30 second rate 0 bps
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 1042 (kbps) Burst 26050 (Bytes)
(pkts matched/bytes matched) 812584/21020804
(total drops/bytes drops) 0/0
Class-map: voice-signaling (match-all)
2734 packets, 336920 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: ip dscp af31 (26)
Queueing
Output Queue: Conversation 265
Bandwidth 8 (kbps) Max Threshold 64 (packets)
(pkts matched/bytes matched) 2734/336920
(depth/total drops/no-buffer drops) 0/0/0
Class-map: class-default (match-any)
79607911 packets, 25344098513 bytes
30 second offered rate 1244000 bps, drop rate 0 bps
Match: any
Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 256
(total queued/total drops/no-buffer drops) 0/22405/0
EWT_NOC#sh int ser4/0:0
Serial4/0:0 is up, line protocol is up
Hardware is DSCC4 Serial
Description: Second T1 to 7204 on Channel 11
Interface is unnumbered. Using address of FastEthernet0/0.10 (172.16.1.1)
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 117/255, rxload 13/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:03, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 22405
Queueing strategy: Class-based queueing
Output queue: 13/1000/64/22405 (size/max total/threshold/drops)
Conversations 2/66/256 (active/max active/max total)
Reserved Conversations 1/1 (allocated/max allocated)
Available Bandwidth 108 kilobits/sec
30 second input rate 81000 bits/sec, 73 packets/sec
30 second output rate 709000 bits/sec, 109 packets/sec
33191015 packets input, 2102745354 bytes, 0 no buffer
Received 64818 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
81839207 packets output, 3906379027 bytes, 0 underruns
0 output errors, 0 collisions, 5 interface resets
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions
Timeslot(s) Used:1-24, SCC: 0, Transmitter delay is 0 flags
09-07-2007 10:55 AM
Other than the interface showing "30 second output rate 709000 bits/sec" and the policy showing "30 second offered rate 1244000 bps, drop rate 0 bps", these don't show drops at 400 Kbps.
For a fast test, to see whether shaping or policing provides the benefit you seek, you could try the shaping or policing in the default class.
09-07-2007 11:41 AM
thanks i'll look into shaping.
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