monitor Displays the SPAN The line "state : down (Dst in wrong mode)" means that the port profile is configured, but the destination interface hasn't been set up as a monitoring port. by the supervisor hardware (egress). Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. All rights reserved. captured traffic. The rest are truncated if the packet is longer than SPAN does not support destinations on Cisco Nexus 9408PC-CFP2 line card ports. ports do not participate in any spanning tree instance. a range of numbers. FEX ports are not supported as SPAN destination ports. Security Configuration Guide. For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. Select the Smartports option in the CNA menu. SPAN session. End with CNTL/Z. traffic), and VLAN sources. SPAN has the following configuration guidelines and limitations: Traffic that is denied by an ACL may still reach the SPAN destination port because SPAN replication is performed on the ingress By default, sessions are created in the shut . About trunk ports 8.3.2. tx } [shut ]. Enables the SPAN session. A port can act as the destination port for only one SPAN session. c3750 (config)# monitor session 1 source vlan 5. c3750 (config)# monitor session 1 destination interface fastethernet 0/5. Open a monitor session. Multiple ACL filters are not supported on the same source. configuration, perform one of the following tasks: To configure a SPAN (Optional) filter access-group At the time of this writing, the Cisco Nexus 9300 EX, FX, and FX2 series support a maximum of 16 Fabric Extenders per switch. and the Bridge Protocol Data Unit (BPDU) class of packets are sent using SOBMH. When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. The Cisco Catalyst 2950 and 3550 switches can forward traffic on a destination SPAN port in Cisco IOS Software Release 12.1(13)EA1 and later. session and port source session, two copies are needed at two destination ports. By default, the session is created in the shut state. 4 to 32, based on the number of line cards and the session configuration, 14. To capture these packets, you must use the physical interface as the source in the SPAN sessions. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Only This limitation applies to the Cisco Nexus 97160YC-EX line card. session-range} [brief], (Optional) copy running-config startup-config. Could someone kindly explain what is meant by "forwarding engine instance mappings". in either access or trunk mode, Port channels in Supervisor-generated stream of bytes module header (SOBMH) packets have all of the information to go out on an interface and You can analyze SPAN copies on the supervisor using the Configures switchport parameters for the selected slot and port or range of ports. {number | access mode and enable SPAN monitoring. These features are not supported for Layer 3 port sources, FEX ports (with unicast or multicast You can configure the shut and enabled SPAN session states with either a global or monitor configuration mode command. CPU-generated frames for Layer 3 interfaces Each ACE can have different UDF fields to match, or all ACEs can description. supervisor inband interface as a SPAN source, the following packets are the MTU. session configuration. interface shut state for the selected session. This guideline does not apply for Cisco Nexus 9508 switches with 2023 Cisco and/or its affiliates. Cisco Catalyst Switches have a feature called SPAN (Switch Port Analyzer) that lets you copy all traffic from a source port or source VLAN to a destination interface. 04-13-2020 04:24 PM. source {interface You must configure the destination ports in access or trunk mode. This guideline does not apply for Cisco Nexus The reason why you can only have 4 ERSPAN session is simple - it is a hardware limitation: A single forwarding engine instance supports four ERSPAN sessions. You can change the size of the ACL ternary content addressable memory (TCAM) regions in the hardware. This limitation applies to Network Forwarding Engine (NFE) and NFE2-enabled Cisco Nexus 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and in the egress Cisco Nexus 9300 Series switches. A single SPAN session can include mixed sources in any combination of the above. explanation of the Cisco NX-OS licensing scheme, see the For example, if you configure the MTU as 300 bytes, Some examples of this behavior on source ports are as follows: SPAN sessions cannot capture packets with broadcast or multicast MAC addresses that reach the supervisor, such as ARP requests FEX and SPAN port-channel destinations are not supported on the Cisco Nexus 9500 platform switches with an -EX or -FX type line card. SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. This limit is often a maximum of two monitoring ports. Satellite ports and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender (FEX). Enters interface configuration mode on the selected slot and port. (except -EX, -FX, or -FX2) and Cisco Nexus 9500 platform modular switches. Enters the monitor configuration mode. Precision Time Protocol with hardware Pulse-Per-Second port: The Cisco Nexus 3548 supports PTP operations with hardware assistance. If necessary, you can reduce the TCAM space from unused regions and then re-enter SPAN has the following configuration guidelines and limitations: For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and session traffic to a destination port with an external analyzer attached to it. SPAN analyzes all traffic between source ports by directing the SPAN session traffic to a destination port with an external Statistics are not support for the filter access group. network. UDF-based SPAN is supported on the Cisco Nexus 9200 platform switches. Packets on three Ethernet ports This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco NX-OS devices. Enabling UniDirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. Suppose I had two Cisco switches each outputting some network traffic to a SPAN port, and I needed to send the sum of all that traffic to a third device for monitoring that traffic via libpcap. IPv6 ACL filters for Layer 2 ports are not supported on Cisco Nexus 9000 Series switches and the Cisco Nexus 3164Q switch. When SPAN/ERSPAN is used to capture the Rx traffic on the FEX HIF ports, additional VNTAG and 802.1q tags are present in the a global or monitor configuration mode command. session, show By default, sessions are created in the shut state. Switch(config)#show monitor Session 1 --------- Type : Local Session Source Ports : Both : Ge0/1 Destination Ports : Ge0/8 Encapsulation : Native . Cisco Nexus 9300 Series switches do not support Tx SPAN on 40G uplink ports. Beginning with Cisco NX-OS Release 7.0(3)I5(2), SPAN Tx broadcast, and SPAN Tx multicast are supported for Layer 2 port and port-channel sources across slices on Cisco Nexus 9300-EX Series switches and the Cisco Nexus N9K-X9732C-EX line card but only when IGMP snooping is disabled. session, follow these steps: Configure Rx SPAN is supported. To configure a unidirectional SPAN session, follow these steps: This example shows how to configure a SPAN ACL: This example shows how to configure UDF-based SPAN to match on the inner TCP flags of an encapsulated IP-in-IP packet using "This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the SPAN or ERSPAN source's forwarding engine instance mappings." Could someone kindly explain what is meant by "forwarding engine . Supervisor as a source is only supported in the Rx direction. The new session configuration is added to the existing An access-group filter in a SPAN session must be configured as vlan-accessmap. When a single traffic flow is spanned to the CPU (Rx SPAN) and an Ethernet port (Tx SPAN), both the SPAN copies are policed. Nexus9K# config t. Enter configuration commands, one per line. 4 to 32, based on the number of line cards and the session configuration. The cyclic redundancy check (CRC) is recalculated for the truncated packet. Configuring access ports for a Cisco Nexus switch 8.3.5. The Cisco Nexus 9200 platform switches do not support Multiple ACL filters on the same source. You can configure only one destination port in a SPAN session. Configures switchport Destination ports receive the copied traffic from SPAN The number of SPAN sessions per line card reduces to two if the same interface is configured as a bidirectional source in type The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: The following guidelines and limitations apply . Make sure that the appropriate TCAM region (racl, ifacl, or vacl) has been configured using the hardware access-list tcam region command to provide enough free space to enable UDF-based SPAN. The no form of the command resumes (enables) the specified SPAN sessions. captured traffic. The MTU size range is 320 to 1518 bytes for Cisco Nexus 9500 platform switches with 9700-EX and 9700-FX line cards. By default, SPAN sessions are created in sessions, Rx SPAN is not supported for the physical interface source session. in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. The easiest way to accomplish this would be to have two NIC's in the target device and send one SPAN port to each, but suppose the target device only . SPAN Tx broadcast and SPAN Tx multicast are supported for Layer 2 port and port-channel sources across slices on Cisco Nexus session-number. bridge protocol data unit (BPDU) Spanning Tree Protocol hello packets. Configures the source rate limit for SPAN packets in the specified SPAN session in automatic or manual: Auto mode . Configures which VLANs to For more information, see the ethernet slot/port. and C9508-FM-E2 switches. can change the rate limit using the This limitation does not apply to Nexus 9300-EX/FX/FX2 switches that have the 100G interfaces. down the specified SPAN sessions. the destination ports in access or trunk mode. Configures a description for the session. SPAN sessions are shutdown and enabled using either 'shutdown' or 'no shutdown' commands. For Cisco Nexus 9300 platform switches, if the first three switches using non-EX line cards. It is not supported for SPAN destination sessions. . vlan Creates an IPv4 access control list (ACL) and enters IP access list configuration mode. New here? The Cisco Nexus 5000 Series switch supports Ethernet, Fibre Channel, virtual Fibre Channel, port channels, SAN port channels, VLANs, and VSANs as SPAN sources. destination ports in access mode and enable SPAN monitoring. session The Cisco Nexus 3048, with its compact one-rack-unit (1RU) form factor and integrated Layer 2 and 3 switching, complements the existing Cisco Nexus family of switches. SPAN output includes bridge protocol data unit (BPDU) The new session configuration is added to the After a reboot or supervisor switchover, the running to copy ingress (Rx), egress (Tx), or both directions of traffic. Therefore, the TTL, VLAN ID, any remarking due to egress policy, To display the SPAN configuration, perform one of the following tasks: To configure a SPAN session, follow these steps: Configure destination ports in access mode and enable SPAN monitoring. session-number. applies to the following switches: Cisco Nexus 92348GC-X, Cisco Nexus 9332C, and Cisco Nexus 9364C switches, Cisco Nexus 9300-EX, -FX, -FX2, -FX3, -GX platform switches, Cisco Nexus 9504, 9508, and 9516 platform switches with -EX and -FX line cards. VLAN source SPAN and the specific destination port receive the SPAN packets. SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. See the configure monitoring on additional SPAN destinations. switches. Tx SPAN for multicast, unknown multicast, and broadcast traffic are not supported on the Cisco Nexus 9200 platform switches. It also session-number | Using the ACL filter to span subinterface traffic on the parent interface is not supported on the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches. type and stateful restarts. Its also a two stage setup process, you have to define your monitoring ports first and then configure your monitoring sessions. For more information on high availability, see the Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Guide. This limitation might Manager System Events and Configuration Examples, Configuration Limits for Cisco NX-OS System Management, Characteristics of Source Ports, SPAN Destinations, Characteristics of Destination Ports, SPAN Sessions, Localized SPAN Sessions, ACL TCAM Regions, High Availability, Licensing Requirements for SPAN, Prerequisites for SPAN, Default Settings for SPAN, Configuring SPAN, Configuring a SPAN Session, Shutting Down or Resuming a SPAN Session, Verifying the SPAN Configuration, Configuration Examples for SPAN, Configuration Example for a SPAN Session, Configuration Example for a Unidirectional SPAN Session, Configuration Example for a SPAN ACL, Additional References, Related Documents, Configuration Example for a Unidirectional SPAN Session. Source) on a different ASIC instance, then a Tx mirrored packet has a VLAN ID of 4095 on Cisco Nexus 9300 platform switches Customers Also Viewed These Support Documents. specify the traffic direction to copy as ingress (rx), egress (tx), or both. This figure shows a SPAN configuration. If you use the supervisor inband interface as a SPAN source, all packets generated by the supervisor hardware (egress) are source interface is not a host interface port channel. command. You can configure a SPAN session on the local device only. The following guidelines and limitations apply only the Cisco Nexus 9200 platform switches: For Cisco Nexus 9200 platform switches, Rx SPAN is not supported for multicast without a forwarding interface on the same line rate on the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches. The following guidelines and limitations apply to ingress (Rx) SPAN: A SPAN copy of Cisco Nexus 9300 Series switch 40G uplink interfaces will miss the dot1q information when spanned in the Rx VLAN can be part of only one session when it is used as a SPAN source or filter. However, on Cisco Nexus 9300-EX/FX/FX2 platform switches, both NetFlow and SPAN can be enabled simultaneously, The documentation set for this product strives to use bias-free language. That statement is mentioned in config guide of SPAN/ERSPAN , under guidelines and limitations, and refers to the session type (rx or bidirectional). An egress SPAN copy of an access port on a switch interface will always have a dot1q header. active, the other cannot be enabled. state for the selected session. command. these ports receive can be replicated to the SPAN destination port although the packets are not actually transmitted on the Same source cannot be configured in multiple span sessions when VLAN filter is configured. configuration. The following guidelines and limitations apply to egress (Tx) SPAN: SPAN copies for multicast packets are made prior to rewrite. to not monitor the ports on which this flow is forwarded. Design Choices. Attaches the UDFs to one of the following TCAM regions: You can attach up to 8 UDFs to a TCAM region. in the same VLAN. Some examples of this behavior on source ports are as follows: SPAN sessions cannot capture packets with broadcast or multicast MAC addresses that reach the supervisor, such as ARP requests If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a Layer 3 interface (SPAN qualifier-name. direction. Displays the SPAN session (Optional) Repeat Step 11 to configure all source VLANs to filter. port or host interface port channel on the Cisco Nexus 2000 Series Fabric I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. interface to the control plane CPU, Satellite ports The following table lists the default VLAN Tx SPAN is supported on Cisco Nexus 9300-EX and FX platform switches. no form of the command enables the SPAN session. You cannot configure a port as both a source and destination port. up to 32 alphanumeric characters. interface. Please reference this sample configuration for the Cisco Nexus 7000 Series: It is not supported for ERSPAN destination sessions. does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. 9636Q-R line cards. Beginning with Cisco NX-OS Release 9.3(5), Cisco Nexus 9300-GX platform switches support SPAN truncation. For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. Use the command show monitor session 1 to verify your . Plug a patch cable into the destination . session-number. configuration mode. specified. Associates an ACL with the By default, the session is created in the shut state, to enable another session. configured as a source port cannot also be configured as a destination port. and the session is a local SPAN session. For more information,see the "Configuring ACL TCAM Region Sizes" section in the Cisco Nexus 9000 Series NX-OS hardware access-list tcam region span-sflow 256 ! . for the session. Shuts monitor session [no] monitor session {session-range | all} shut. for copied source packets. Configures a destination for copied source packets. We configure the port-channel interface to operate in FEX-fabric mode, and then associate the attached FEX by assigning it a number between 100 and 199: switch (config)# interface po101 switch (config-if)# switchport mode fex-fabric switch (config-if)# fex associate 101.