A-4
Cisco AVVID Network Infrastructure Enterprise Quality of Service Design
956467
Appendix A Reference Information
DLSW+ Considerations
DLSW+ Considerations
A potential issue arises with recommended LLQ/CBWFQ admission criteria for AVVID when DLSW+
traffic is present in the network. DLSw+ traffic is marked with an IP Precedence of 5 (DSCP 40) by
default when DLSw+ is enabled on a router. This may interfere with, and adversely affect, bandwidth
provisioning policies. The solution is to modify DLSw+ traffic marking.
First ensure that the DLSw+ priority statement is not being used to classify DLSw+ traffic with multiple
IP Precedence values utilizing multiple TCP/IP ports for communication. If this is not the case, the
following commands can be added to the configuration of DLSw+ peer routers to change the default
DLSw+ IP Precedence to 2.
dlsw local-peer peer-id 192.168.10.1
dlsw remote-peer 0 tcp 192.168.100.1
dlsw tos map high 2 medium 2 normal 2 low 2
Because DLSw+ does not currently support the full DSCP range, a separate match statement for ToS 2
(DSCP 16) would be required in the class-map for mission-critical data on the WAN edges. An example
is shown:
class-map match-any GOLD-DATA
match ip dscp 16
Assigns newly-modified DLSw+ traffic to Gold class.
match ip dscp af21
match ip dscp af22
Tip
For additional information, refer to the Cisco alert titled DLSw+ Marks Its Traffic with IP Precedence
of 5 (internal).
SFTP
990
Secure FTP
secure-ftp
SHTTP
443
Secure HTTP
secure-http
SIMAP
585, 993
Secure IMAP
secure-imap
SIRC
994
Secure IRC
secure-irc
SLDAP
636
Secure LDAP
secure-ldap
SMTP
25
Simple Mail Transfer Protocol
smtp
SNMP
161, 162
Simple Network Management Protocol
snmp
SNNTP
563
Secure NNTP
secure-nntp
SOCKS
1080
Firewall security protocol
socks
SPOP3
995
Secure POP3
secure-pop3
SSH
22
Secured Shell
ssh
STELNET
992
Secure Telnet
secure-telnet
Sun
111
Sun RPC
Telnet
23
Telnet Protocol
telnet
X Window System
6000-6003
X11, X Window System
xwindows
Application
TCP Ports
Description
NBAR Keyword