Solved: Best Practices Metro Ethernet QoS? - Page 2

pnicolette · ‎03-11-2008

Our sites connect via routers into a single Metro Ethernet (TLS) VLAN. The main site with most servers and the Internet link uses a 100Mb TLS circuit, same for another big site; the rest are 10Mb. Majority of traffic is outbound from main site to others. There's no VoIP, limited streaming video, but occasional congestion when a large file transfer hogs a 10Mb pipe with default FIFO queue.

Where to start for QoS?

Can the main site router enforce separate 10Mb output limits for each destination, even though they share one interface?

Or should I apply input service policies to the TLS interfaces of the other routers?

Or a better way....?

Thanks much for any ideas!

Paul

pnicolette · ‎03-14-2008

Thanks again!

Finally [thanks for your patience, hope this helps others]...

What are pros/cons in my mostly hub-spoke world of using dscp designations like cs1, cs2, cs3 versus the newer, more complex scheme like ef, af31, af11, be and such?

Joseph W. Doherty · ‎03-14-2008

Actually you mean the pros/cons of DSCP vs. IP Precendence?

The former provides six bits for marking vs. only 3 bits for the latter. Using RFC recommendations, priorities overlap between the two and the additional DSCP bits are used for indicating drop precedence.

If you're going to mark at all, I would recommend using DSCP. Of course, you don't need markings to deliver QoS, it's just convenient for downstream devices (so they don't have to analyse the traffic again).

mesutcap81 · ‎01-15-2014

Hi Joseph,

I used your config for our qos environement which has a diagram below. Central and all branchs connected to ISP/MPLS cloud via metro ethernet lines witch different bandwidths. Central connected 100Mb, other branchs has different bandwidths.

We need QoS both central and branchs for especially voip RTP and signallling traffic. So i used your config but we have some problems.

As you see following outputs Class-map: Branch-A has 1024Kb bw and using 1024Kb bandwitdth but under Service-policy "queue",

Class-map: "realtime" and "signal" using 20000 and 5000Kb bandwidth. Actually i want to use 20% and 5% of 1024Kb.

What is the issue outthere?

Router:Cisco 3845

IOS:c3845-spservicesk9-mz.124-13f.bin

Thanks in advance.

Central_Router#sh policy-map interface g0/0

GigabitEthernet0/0

Service-policy output: central

Class-map: Branch-A (match-all)

133672 packets, 93715046 bytes

5 minute offered rate 372000 bps, drop rate 0 bps

Match: access-group name Branch-A

Traffic Shaping

Target/Average Byte Sustain Excess Interval Increment

Rate Limit bits/int bits/int (ms) (bytes)

100000000/100000000 625000 2500000 2500000 25 312500

Adapt Queue Packets Bytes Packets Bytes Shaping

Active Depth Delayed Delayed Active

- 0 133672 93715046 0 0 no

Queueing

Output Queue: Conversation 265

Bandwidth 1 (%)

Bandwidth 1024 (kbps)Max Threshold 64 (packets)

(pkts matched/bytes matched) 454/409201

(depth/total drops/no-buffer drops) 0/0/0

Service-policy : queue

Class-map: realtime (match-all)

0 packets, 0 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp ef (46)

Queueing

Strict Priority

Output Queue: Conversation 264

Bandwidth 20 (%)

Bandwidth 20000 (kbps) Burst 500000 (Bytes)

(pkts matched/bytes matched) 0/0

(total drops/bytes drops) 0/0

Class-map: signal (match-all)

0 packets, 0 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: ip dscp af31 (26)

Queueing

Output Queue: Conversation 265

Bandwidth 5 (%)

Bandwidth 5000 (kbps)Max Threshold 64 (packets)

(pkts matched/bytes matched) 0/0

(depth/total drops/no-buffer drops) 0/0/0

Class-map: class-default (match-any)

133672 packets, 93715046 bytes

!---INPUT-----

!

policy-map mark

class RTP_AUDIO

set ip dscp ef

class SIGNALLING

set ip dscp af31

!

class-map match-any RTP_AUDIO

match access-group name rtp

!

ip access-list extended rtp

permit udp any any range 16384 32767

!

class-map match-any SIGNALLING

match ip dscp cs3

match access-group name signalling

!

ip access-list extended signalling

remark H323

permit tcp any any range 1720 1721

remark SKINNY

permit tcp any any range 2000 2002

permit udp any any range 1720 1721

remark MGCP

permit udp any any eq 2427

remark SIP

permit tcp any any eq 5060

permit udp any any eq 5060

!

!----OUTPUT-----

policy-map queue

class realtime

priority percent 20

class signal

bandwidth percent 5

class class-default

fair-queue

!

class-map match-all realtime

match ip dscp ef

!

class-map match-all signal

match ip dscp af31

!

!---OUTPUT with BRANCH-----

!

policy-map central

class Branch-A

shape average 100000000

bandwidth percent 1

service-policy queue

class Branch-B

shape average 100000000

bandwidth percent 1

service-policy queue

class Branch-C

shape average 100000000

bandwidth percent 2

service-policy queue

class Branch-D

shape average 100000000

bandwidth percent 2

service-policy queue

!

class-map match-all Branch-A

match access-group name Branch-A

class-map match-all Branch-B

match access-group name Branch-B

class-map match-all Branch-C

match access-group name Branch-C

class-map match-all Branch-D

match access-group name Branch-D

!

ip access-list extended Branch-A

permit ip any 10.34.128.0 0.0.7.255

ip access-list extended Branch-B

permit ip any 10.34.112.0 0.0.7.255

ip access-list extended Branch-C

permit ip any 10.34.152.0 0.0.7.255

ip access-list extended Branch-D

permit ip any 10.35.144.0 0.0.7.255

!

interface GigabitEthernet0/0

bandwidth 102400

ip address 172.100.0.2 255.255.255.248

service-policy output central

!

interface GigabitEthernet0/1

ip address 172.18.0.2 255.255.255.252

service-policy input mark

!

mesutcap81 · ‎01-23-2014

Solved after IOS upgrade, thanx.