Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 704
Encapsulated Remote Port Monitoring
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Configuring RSPAN Source Sessions to Avoid BPD Issues When ever you configure an RPM source session, you must ensure the following to avoid BPDU issues: 1 Enable control plane egress acl using the following command: mac control-plane egress-acl 2 Create an extended MAC access list and add a deny rule of (0x0180c2xxxxxx) packets using the following commands: mac access-list extended mac2 seq 5 deny any 01:80:c2:00:00:00 00:00:00:ff:ff:ff count 3 Apply ACL on that RPM VLAN. In this example RPM vlan is 10. DellEMC#show running-config interface vlan 10 ! interface Vlan 10 no ip address mode remote-port-mirroring tagged Port-channel 2 mac access-group mac2 out no shutdown 4 Create Source RPM session as follows (port-channel 1 and port-channel 2 are LACP). DellEMC(conf)#monitor session 1 type rpm DellEMC(conf-mon-sess-1)#source port-channel 1 destination remote-vlan 10 dir rx DellEMC(conf-mon-sess-1)#no disable 5 Show the output for the LACP. DellEMC#show interfaces port-channel brief Codes: L - LACP Port-channel O - OpenFlow Controller Port-channel LAG Mode L1 L3 L2 L2 DellEMC# Status up up Uptime 00:01:17 00:00:58 Ports Te 1/4 Te 1/5 (Up) (Up) Encapsulated Remote Port Monitoring Encapsulated Remote Port Monitoring (ERPM) copies traffic from source ports/port-channels or source VLANs and forwards the traffic using routable GRE-encapsulated packets to the destination IP address specified in the session. NOTE: When configuring ERPM, follow these guidelines • The Dell EMC Networking OS supports ERPM source session only. Encapsulated packets terminate at the destination IP address or at the analyzer. • You can configure up to four ERPM source sessions on switch. • Configure the system MTU to accommodate the increased size of the ERPM mirrored packet. • The maximum number of source ports you can define in a session is 128. • The system encapsulates the complete ingress or egress data under GRE header, IP header, and outer MAC header and sends it out at the next hop interface as pointed by the routing table. • Specify flow-based enable in case of source as VLAN or where you need monitoring on a per-flow basis. • Specify the monitor keyword in the access list rules for which you want to mirror. • The system allows you to configure up to four ERPM sessions. • ERPM sessions do not copy locally sourced remote VLAN traffic from source trunk ports that carry RPM VLANs. ERPM sessions do not copy locally sourced ERPM GRE-encapsulated traffic from source ports. • Flow-based mirroring is supported only for source VLAN ingress traffic. Changes to Default Behavior • Rate-limiting is supported for the ERSPAN traffic. 704 Port Monitoring
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