QOS Question

[raman singh]

Hi Harith,

Can you please confirm below 2 questions for me?

 

Question 1 - If in exam they ask us to mark the MGCP signaling traffic. Should be apply one common access list or  we only have to choose MGCP signaling

 

Which one from below we should choose? 1 or 2

 

1.

ip access-list extended CALL-SIGNALING
 remark *** Signalling ***
 permit udp any any eq 2427
 permit tcp any any eq 2428

 permit tcp any any range 2000 2002

 permit tcp any any eq 5060
 permit udp any any eq 5060

ip access-list extended VOICE
 permit udp any any range 16384 32767

 

2.

ip access-list extended CALL-SIGNALING
 remark *** Signalling ***
 permit udp any any eq 2427
 permit tcp any any eq 2428

 

Question 2 - As they ask to mark MGCP traffic in HQ Phone 1 in Exam, Shoud we apply service polity to HQ Phone 1 interface as well as trunk? Which one we should choose 1 or 2  Also for trunk interface should be put priority-queue out

 

1.

class mgcp
match access-group name CALL-SIGNALING
 
policy-map policemap
class mgcp
police 16000 8000 exceed-action drop
 
interface gi1/0/1
descp HQ SWITCH TRUNK
auto qos voip trust
priority queue out

service-policy input policemap

 

interface Fa1/0/1
descp HQ Phone 1

switchport mode access

switchport access vlan 100
switchport voice vlan 102
mls qos trust cos
auto qos voip trust
priority queue out

service-policy input policemap

 

 

2.

class mgcp
match access-group name CALL-SIGNALING
 
policy-map policemap
class mgcp
police 16000 8000 exceed-action drop
 
interface gi1/0/1
descp HQ SWITCH TRUNK
auto qos voip trust
priority queue out

service-policy input policemap

  

[Harith Kariapper]

Check the answers below.

 

 

Thank You.,

Harith Kariapper

B.Sc.Eng., CNE, MIBM, MCSE, JNCIA, CCSI
Quadruple CCIE #8661 (Voice, SP, Security, R/S)
www.winnetsystems.co.uk          44-207-096-1039
www.winnet.ca                             1-416-447-8378

---

From: winnet-20...@googlegroups.com [mailto:winnet-20...@googlegroups.com] On Behalf Of raman singh
Sent: Friday, April 09, 2010 2:17 PM
To: winnet-20...@googlegroups.com
Subject: QOS Question

 

Hi Harith,

Can you please confirm below 2 questions for me?

 

Question 1 - If in exam they ask us to mark the MGCP signaling traffic. Should be apply one common access list or  we only have to choose MGCP signaling

 

Which one from below we should choose? 1 or 2

 

1.

ip access-list extended CALL-SIGNALING
 remark *** Signalling ***
 permit udp any any eq 2427
 permit tcp any any eq 2428

 permit tcp any any range 2000 2002

 permit tcp any any eq 5060
 permit udp any any eq 5060

ip access-list extended VOICE
 permit udp any any range 16384 32767

 

2.

ip access-list extended CALL-SIGNALING
 remark *** Signalling ***
 permit udp any any eq 2427
 permit tcp any any eq 2428

 

 

**************  Answer #2 is correct.  Also do “mls qos trust cos”  on all other IP Phone ports and “mls qos trust dscp” on all the server ports and truck ports. --- only on HQ-3750 switch.

service-policy input policemap

 

 

*************** It looks like your HQ-Ph1 is in fa1/0/1 .( I assume it because you have configured voice vlan on that port.)

 

If they ask mark MGCP on HQ-Ph1 then you do not need to apply the service policy on the trunk. ( I understand, it look weird because you never get MGCP traffic on HQ-Ph1 interface. )

 

So the correct config will be

 

class mgcp
match access-group name CALL-SIGNALING
 
policy-map policemap
class mgcp
police 16000 8000 exceed-action drop

interface Fa1/0/1
descp HQ Phone 1

switchport mode access

switchport access vlan 100
switchport voice vlan 102

service-policy input policemap

 

Also do “mls qos trust cos”  on all other IP Phone ports and “mls qos trust dscp” on all the server ports and truck ports. --- only on HQ-3750 switch.

 

No priority queue command is necessary for this configuration.

  

[raman singh]

Thanks Harith!!