Policy-map issue on 7507

Question

I have a 7507 that has policy maps for matching voice for QoS. A show access-list shows that traffic is being matched. A show interface shows that packets are being dropped. The end result is though, that latency is high and call quality is suffering. A show queueing on the interface shows that no packets are being dropped. Any suggestions?

Answer 1

class-map match-all 2505PlanoRd
match access-group name PlanoRd2505-voice
policy-map 2505PlanoRd
class 2505PlanoRd
priority 192
class class-default
fair-queue
interface Serial5/0/0/5:0
bandwidth 1536
ip address xx.xx.xx.xx 255.255.255.252
no ip redirects
no ip unreachables
load-interval 30
service-policy output 2505PlanoRd
ip access-list extended PlanoRd2505-voice
permit ip any any dscp ef
permit ip any any dscp cs6
permit ip any host xx.xx.xx.xx
Core-1#sh access-list PlanoRd2505-voice
Extended IP access list PlanoRd2505-voice
10 permit ip any any dscp ef (124045 matches)
20 permit ip any any dscp cs6 (9779 matches)
30 permit ip any host xx.xx.xx.xx (93010 matches)
Core-1#sh queueing int s5/0/0/5:0
Interface Serial5/0/0/5:0 queueing strategy: VIP-based fair queueing
Serial5/0/0/5:0 queue size 0
pkts output 0, wfq drops 0, nobuffer drops 0
WFQ: aggregate queue limit 384 max available buffers 384
Priority Class: limit 48 qsize 0 pkts output 0 drops 0
Non-Priority Class: limit 336 qsize 0 pkts output 0 drops 0
available bandwidth 1344
Class 0: weight 8750 limit 336 qsize 0 pkts output 0 drops 0
Core-1#sh int s5/0/0/5:0
Serial5/0/0/5:0 is up, line protocol is up
Hardware is cyBus CT3
Internet address is xx.xx.xx.xx
MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
reliability 255/255, txload 72/255, rxload 12/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/32 (size/max/drops/flushes); Total output drops: 510996
Queueing strategy: Class-based queueing
Output queue: 0/40 (size/max)
30 second input rate 77000 bits/sec, 57 packets/sec
30 second output rate 439000 bits/sec, 78 packets/sec
80041948 packets input, 17598546217 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 9 giants, 0 throttles
696964 input errors, 38821 CRC, 302664 frame, 92 overrun, 1 ignored, 355377 abort
113990388 packets output, 96683334345 bytes, 0 underruns
0 output errors, 0 collisions, 10 interface resets
0 output buffer failures, 3437585 output buffers swapped out
10 carrier transitions no alarm present
Timeslot(s) Used: 1-24, Transmitter delay is 0 flags
non-inverted data
This is standard VoIp transport selection based on dscp.