[cisco-voip] Protecting Database replication from publisher to subscriber (SRND page 2-19)

[Jason Aarons (US)]

Since CallManager 4.x marks TCP 8002 (SDL) as AF31 I'm going to
recommend we not modify the AutoQoS Policy to include TCP/1433 or
TCP/1434 for SQL Replication unless Cisco changes the SRND <grin>. 

 

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note0
9186a00801ffe28.shtml

 

________________________________

From: Wes Sisk [mailto:wsisk at cisco.com] 
Sent: Monday, October 23, 2006 10:56 AM
To: Jason Aarons (US)
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Protecting Database replication from publisher
to subscriber (SRND page 2-19)

 

SQL replication isn't so time sensitive.  It's the SDL links
(ccm.exe/ctimanager.exe:random port<->ccm.exe:8002) that are sensitive
to latency/delay.

/Wes

Jason Aarons (US) wrote: 

In practice has anyone seen a QoS policy protecting the SQL intercluster
communication/replication? Cisco Engineer is worried about SQL
replication in a large cluster design. All links meet the 40ms Cluster
Across WAN requirement, but he'd like to take it further. I'm not sure
if it's a good idea.

 

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note0
9186a00801ffe28.shtml


Intra-cluster Communications 


This is traffic between Cisco CallManager nodes/servers themselves, and
includes things like Cisco CallManager and computer telephony
integration (CTI) Manager SDL communications, SQL replication, Server
Message Block (SMB) communications and CTI/Quick Buffer Encoding (QBE)
activities. If you have a Layer 3 device that separates Cisco
CallManager nodes (by either WAN or LAN), you must have a maximum Round
Trip Time (RTT) of 40 ms, or 20 ms delay in either direction. 

Database replication from publisher to subscriber uses best effort
(DSCP=0) by default. 

Directory traffic from the LDAP directory also uses best effort packet
marking. 

For real-time traffic via Intercluster Communications (ICCS), which
includes signaling, call admission control, and so forth, as well as CTI
Manager realtime traffic, a DSCP value of 26 (AF31 or IP precedence 3)
is used. 

Standard AutoQoS Policy

 

class-map match-any AutoQoS-VoIP-Remark

 match ip dscp ef 

 match ip dscp cs3 

 match ip dscp af31 

class-map match-any AutoQoS-VoIP-Control-UnTrust

 match access-group name AutoQoS-VoIP-Control

class-map match-any AutoQoS-VoIP-RTP-UnTrust

 match protocol rtp audio 

 match access-group name AutoQoS-VoIP-RTCP

!

policy-map AutoQoS-Policy-UnTrust

 class AutoQoS-VoIP-RTP-UnTrust

  priority percent 70

  set dscp ef

 class AutoQoS-VoIP-Control-UnTrust

  bandwidth percent 5

  set dscp af31

 class AutoQoS-VoIP-Remark

  set dscp default

 class class-default

  fair-queue

 

interface Serial0/0/0

 description SerialT1 

 auto qos voip 

 service-policy output AutoQoS-Policy-UnTrust

!

ip access-list extended AutoQoS-VoIP-Control

 permit tcp any any eq 1720

 permit tcp any any range 11000 11999

 permit udp any any eq 2427

 permit tcp any any eq 2428

 permit tcp any any range 2000 2002

 permit udp any any eq 1719

 permit udp any any eq 5060

ip access-list extended AutoQoS-VoIP-RTCP

 permit udp any any range 16384 32767

 

 

 

 

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