Catalyst QoS – Per port, Per VLAN classification
September 11, 2008 at 5:26 pm | In QoS, Switching | 1 CommentConfigure SW3 to mark traffic comming to the trunk interface Fa0/16 fromm VLAN201 to IP Precedence 1, and from VLAN 202 to IP Precedence 2.
Topology:
VLAN201 VLAN201 | | | | | | SW2 ------------- SW3 | | | | | | VLAN202 VLAN202
Configuration
SW3# ! class-map match-all VLAN202 match vlan 202 class-map match-all VLAN201 match vlan 201 ! ! policy-map MARK_PREC class VLAN201 set ip precedence 1 class VLAN202 set ip precedence 2 !
Note that within a class-map, match VLAN has to be followed by a match class-map (nested configuration). See the wrong configuration example without match class-map (above) and the error message when the service policy is applied onto the interface:
SW3(config)#int fa0/16 SW3(config-if)#service-policy input MARK_PREC QoS: match class-map must follow match vlan in class-map VLAN201. QoS: Policy map MARK_PREC failed vlan check Service Policy attachment failed *Mar 1 05:45:32.418: %QM-4-MATCH_NOT_SUPPORTED: Match type is not supported in classmap VLAN201
SW3(config)#class-map match-all VLAN202 SW3(config-cmap)#match vlan 202 SW3(config-cmap)#match class-map IP_TRAFFIC SW3(config)#class-map match-all VLAN201 SW3(config-cmap)#match vlan 201 SW3(config-cmap)#match class-map IP_TRAFFIC
SW3(config-cmap)#int fa0/16 SW3(config-if)#service-policy input MARK_PREC
Verification
SW3(config)#int vlan 201 SW3(config-if)#ip accounting precedence input SW3# SW3# SW3#sh int vlan 201 precedence Vlan201 Input (none) SW2#ping 201.0.0.9 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 201.0.0.9, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/9 ms SW3#sh int vlan 201 precedence Vlan201 Input Precedence 0: 5 packets, 590 bytes SW3#sh mls qos QoS is disabled SW3#c Enter configuration commands, one per line. End with CNTL/Z. SW3(config)#mls qos QoS: ensure flow-control on all interfaces are OFF for proper operation. SW3(config)# SW3# SW3# SW3#sh mls qos QoS is enabled SW2#ping 201.0.0.9 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 201.0.0.9, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/9 ms SW3#sh int vlan 201 precedence Vlan201 Input Precedence 0: 5 packets, 590 bytes Precedence 1: 5 packets, 590 bytes SW2#ping 202.0.0.9 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 202.0.0.9, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms SW3#sh int vlan 202 precedence Vlan202 Input Precedence 2: 5 packets, 590 bytes
Alternatively on a C3550 we can use “mls qos monitor dscp” on physical interface to count number of packets with a particular IP Precendence or DSCP values.
SW3#c Enter configuration commands, one per line. End with CNTL/Z. SW3(config)#int fa0/16 SW3(config-if)#mls qos SW3(config-if)#mls qos mo SW3(config-if)#mls qos monitor ? bytes Collect byte statistics dscp Collect DSCP statistics packets Collect packet statistics SW3(config-if)#mls qos monitor ds SW3(config-if)#mls qos monitor dscp ? <0-63> DSCP values separated by spaces (up to 8 values total) SW3(config-if)#mls qos monitor dscp 0 ? <0-63> DSCP values separated by spaces (up to 8 values total) <cr> SW3(config-if)#mls qos monitor dscp 0 8 16 SW3(config-if)# SW3# SW3# SW3# SW3# SW3# SW3# *Mar 1 06:00:28.574: %SYS-5-CONFIG_I: Configured from console by console SW3#c Enter configuration commands, one per line. End with CNTL/Z. SW3(config)#int fa0/16 SW3(config-if)#mls qos monitor packets QoS: This command is only applicable on a master port. On a 24 ports switch: -port 1 controls interface 1 to 12 -port 13 controls interface 13 to 24 On a 48 ports switch: -port 25 controls interface 25 to 36 -port 37 controls interface 37 to 48 SW3(config-if)# SW3(config-if)# SW3(config-if)#int fa0/13 SW3(config-if)#mls qos monitor packets SW3(config-if)# SW2#ping 201.0.0.9 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 201.0.0.9, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/4/9 ms SW2#ping 202.0.0.9 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 202.0.0.9, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/8 ms SW3#sh mls qos int fa0/16 statistics FastEthernet0/16 Ingress dscp: incoming no_change classified policed dropped (in pkts) 0 : 14 4 0 0 0 8 : 0 0 5 0 0 16: 0 0 5 0 0 Others: 0 0 0 0 0 Egress dscp: incoming no_change classified policed dropped (in pkts) 0 : 5 n/a n/a 0 0 8 : 5 n/a n/a 0 0 16: 5 n/a n/a 0 0 Others: 69 n/a n/a 0 0 SW3#
Blog at WordPress.com. | Theme: Pool by Borja Fernandez.
Entries and comments feeds.
