From: gladston@br.ibm.com
Date: Thu Aug 25 2005 - 18:15:35 GMT-3
Tests using the new feature 'Frame Relay Queueing and Fragmentation at the Interface' indicates that interleaves only occurs for traffic from priority queue.
DOC CD says that traffic from other class are interleaved with traffic from class default.
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Frame Relay Queueing and Fragmentation at the Interface
Frames from the priority queue and class queues are subject to fragmentation and interleaving.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/frfrintq.htm#wp1025089
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Any feedback appreciated.
Tests:
Traffic consist of two steps:
step 1
-1500 bytes packet size generated by SAA <-- goes to class default
-80 bytes packets size generated by SAA <--- goes to normal class
No interleaves occured.
Rack2R2#sh int ser 0/1 | i interle
Fragmentation type: end-to-end, size 160, PQ interleaves 0
step 2
Added this:
-Telnet packets <--- goes priority queue
Rack2R2#sh int ser 0/1 | i interle
Fragmentation type: end-to-end, size 160, PQ interleaves 104
Monitoring CBWFQ:
Before Telnet
Rack2R2#sh pol int ser 0/1
Serial0/1
Service-policy output: guarantee-band
Class-map: normal (match-all)
47585 packets, 2474660 bytes
1 minute offered rate 98000 bps, drop rate 0 bps
Match: packet length min 48 max 100
Queueing
Output Queue: Conversation 41
Bandwidth 48 (kbps) Max Threshold 64 (packets)
(pkts matched/bytes matched) 47582/2474468
(depth/total drops/no-buffer drops) 1/0/0
Class-map: high-pri (match-all)
0 packets, 0 bytes
1 minute offered rate 0 bps, drop rate 0 bps
Match: access-group 105
Queueing
Strict Priority
Output Queue: Conversation 40
Bandwidth 48 (kbps) Burst 1200 (Bytes)
(pkts matched/bytes matched) 0/0
(total drops/bytes drops) 0/0
Class-map: class-default (match-any)
47599 packets, 71554666 bytes
1 minute offered rate 2016450 bps, drop rate 1983000 bps
Match: any
After Telnet
Rack2R2#sh pol int ser 0/1
Serial0/1
Service-policy output: guarantee-band
Class-map: normal (match-all)
585109 packets, 2474660 bytes
1 minute offered rate 98000 bps, drop rate 0 bps
Match: packet length min 48 max 100
Queueing
Output Queue: Conversation 41
Bandwidth 48 (kbps) Max Threshold 64 (packets)
(pkts matched/bytes matched) 47582/2474468
(depth/total drops/no-buffer drops) 1/0/0
Class-map: high-pri (match-all)
407 packets, 18371 bytes
1 minute offered rate 0 bps, drop rate 0 bps
Match: access-group 105
Queueing
Strict Priority
Output Queue: Conversation 40
Bandwidth 48 (kbps) Burst 1200 (Bytes)
(pkts matched/bytes matched) 407/18371
(total drops/bytes drops) 0/0
Class-map: class-default (match-any)
765586 packets, 71554666 bytes
1 minute offered rate 2773000 bps, drop rate 2753000 bps
Match: any
Configs:
class-map match-all normal
match packet length min 48 max 100
class-map match-all high-pri
match access-group 105
policy-map guarantee-band
class normal
bandwidth 48
class high-pri
priority 48
interface Serial0/1
ip address 23.23.23.3 255.255.255.0
en frame
frame-relay map ip 23.23.23.2 123 br
frame-relay fragment 160 end
service-pol out guarantee-band
access-list 105 permit tcp a a eq telnet
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