Remote Port Mirroring; Remote Port Mirroring Example - Dell S4820T Configuration Manual

Example of the flow-based enable Command
To view an access-list that you applied to an interface, use the show ip accounting access-list
command from EXEC Privilege mode.
Dell(conf)#monitor session 0
Dell(conf-mon-sess-0)#flow-based enable
Dell(conf)#ip access-list ext testflow
Dell(config-ext-nacl)#seq 5 permit icmp any any count bytes monitor
Dell(config-ext-nacl)#seq 10 permit ip 102.1.1.0/24 any count bytes monitor
Dell(config-ext-nacl)#seq 15 deny udp any any count bytes
Dell(config-ext-nacl)#seq 20 deny tcp any any count bytes
Dell(config-ext-nacl)#exit
Dell(conf)#interface tengigabitethernet 1/1
Dell(conf-if-te-1/1)#ip access-group testflow in
Dell(conf-if-te-1/1)#show config
!
interface TenGigabitEthernet 1/1
ip address 10.11.1.254/24
ip access-group testflow in
shutdown
Dell(conf-if-te-1/1)#exit
Dell(conf)#do show ip accounting access-list testflow
!
Extended Ingress IP access list testflow on TenGigabitEthernet 1/1
Total cam count 4
seq 5 permit icmp any any monitor count bytes (0 packets 0 bytes)
seq 10 permit ip 102.1.1.0/24 any monitor count bytes (0 packets 0 bytes)
seq 15 deny udp any any count bytes (0 packets 0 bytes)
seq 20 deny tcp any any count bytes (0 packets 0 bytes)
Dell(conf)#do show monitor session 0
SessionID Source Destination Direction Mode
--------- ------ ----------- --------- ----
0 Te 1/1 Te 1/2

Remote Port Mirroring

While local port monitoring allows you to monitor traffic from one or more source ports by directing it to
a destination port on the same switch/router, remote port mirroring allows you to monitor Layer 2 and
Layer 3 ingress and/or egress traffic on multiple source ports on different switches and forward the
mirrored traffic to multiple destination ports on different switches.
Remote port mirroring helps network administrators monitor and analyze traffic to troubleshoot network
problems in a time-saving and efficient way.
In a remote-port mirroring session, monitored traffic is tagged with a VLAN ID and switched on a user-
defined, non-routable L2 VLAN. The VLAN is reserved in the network to carry only mirrored traffic, which
is forwarded on all egress ports of the VLAN. Each intermediate switch that participates in the transport of
mirrored traffic must be configured with the reserved L2 VLAN. Remote port monitoring supports
mirroring sessions in which multiple source and destination ports are distributed across multiple switches

Remote Port Mirroring Example

Remote port mirroring uses the analyzers shown in the aggregation network in Site A.
The VLAN traffic on monitored links from the access network is tagged and assigned to a dedicated L2
VLAN. Monitored links are configured in two source sessions shown with orange and green circles. Each
Port Monitoring
rx interface Flow-based
Type
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