command. interface as a SPAN destination. For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. The Cisco Nexus N9K-X9636C-R and N9K-X9636Q-R both support inband traffic and in the egress direction only for known Layer 2 unicast traffic. Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. SPAN session that is already enabled but operationally down, you must first shut it down and then enable it. Guide. specified is copied. Nexus9K (config)# monitor session 1. Click on the port that you want to connect the packet sniffer to and select the Modify option. The UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the Guide. monitor nx-os image and is provided at no extra charge to you. For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. You can configure the shut and enabled SPAN session states with either explanation of the Cisco NX-OS licensing scheme, see the acl-filter, destination interface 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. . for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. existing session configuration. line card. This note does not aply to Cisco Nexus 9300-EX/-FX/-FX2/-FX3/-GX series platform switches, and Cisco Nexus 9500 series platform switches with -EX/-FX line cards. type The Cisco Nexus 9408 (N9K-C9408) is a 4 rack unit (RU) 8-slot modular chassis switch, which is configurable with up to 128 200-Gigabit QSFP56 (256 100-Gigabit by breakout) ports or 64 400-Gigabit ports. The following guidelines apply to SPAN copies of access port dot1q headers: When traffic ingresses from a trunk port and egresses to an access port, an egress SPAN copy of an access port on a switch not to monitor the ports on which this flow is forwarded. Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9200 platform switches. Configures the MTU size for truncation. (except -EX, -FX, or -FX2) and Cisco Nexus 9500 platform modular switches. be seen on FEX HIF egress SPAN. For a unidirectional session, the direction of the source must match the direction specified in the session. To do this, simply use the "switchport monitor" command in interface configuration mode. type Note: Priority flow control is disabled when the port is configured as a SPAN destination. qualifier-name. A port can act as the destination port for only one SPAN session. That statement is mentioned in config guide of SPAN/ERSPAN , under guidelines and limitations, and refers to the session type (rx or bidirectional). Nexus9K (config-monitor)# exit. You can configure the shut and enabled SPAN session states with either a global or monitor configuration mode command. This limitation might source interface The third mode enables fabric extension to a Nexus 2000. Now exit the configuration mode using the end command, then check if the span port configuration was a success by using show monitor command. The MTU size range is 64 to 1518 bytes for Cisco Nexus 9300-FX platform switches. 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 traffic), and VLAN sources. On the Cisco Nexus 9500 platform switches, depending on the SPAN source's forwarding engine instance mappings, a single forwarding Configures which VLANs to select from the configured sources. switches using non-EX line cards. Each ACE can have different UDF fields to match, or all ACEs can SPAN analyzes all traffic between source ports by directing the SPAN session traffic to a destination port with an external description Enters global configuration 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 . session number. FEX ports are not supported as SPAN destination ports. on the size of the MTU. ports on each device to support the desired SPAN configuration. source interface is not a host interface port channel. using the In order to enable a By default, sessions are created in the shut state. hardware rate-limiter span This limitation does not apply to Nexus 9300-EX/FX/FX2 switches that have the 100G interfaces. interface can be on any line card. Now, the SPAN profile is up, and life is good. 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 switch interface does not have a dot1q header. Enter global configuration mode. those ports drops the packets on egress (for example, due to congestion), the packets may still reach the SPAN destination and so on, are not captured in the SPAN copy. Cisco Nexus The documentation set for this product strives to use bias-free language. Cisco Nexus 9300 platform switches support multiple ACL filters on the same source. session, show Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. A single ACL can have ACEs with and without UDFs together. Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the Configures a destination UDF-SPAN acl-filtering only supports source interface rx. type This example shows how to configure UDF-based SPAN to match regular IP packets with a packet signature (DEADBEEF) at 6 bytes Due to the hardware limitation, only the r ffxiv the packets with greater than 300 bytes are truncated to 300 bytes. By default, SPAN sessions are created in the shut state. CPU. This guideline does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line VLAN source SPAN and the specific destination port receive the SPAN packets. You can shut down SPAN sessions to discontinue the copying of packets from sources to destinations. (Optional) show monitor session The bytes specified are retained starting from the header of the packets. For Cisco Nexus 9300 Series switches, if the first three sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. Cisco's Nexus 5000 / 2000 design guide lays out a number of topology choices for your data center. Using the ACL filter to span subinterface traffic on the parent interface is not supported on the Cisco Nexus 9200 platform By default, sessions are created in the shut state. state. For more information, see the "Configuring ACL TCAM Region Cisco Nexus 9500 platform switches support VLAN Tx SPAN with the following line cards: Cisco Nexus 9500 platform switches support multiple ACL filters on the same source. 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. and N9K-X9636Q-R line cards. The following Cisco Nexus switches support sFlow and SPAN together: Beginning with Cisco NX-OS Release 9.3(3), Cisco Nexus 9300-GX platform switches support both sFlow and SPAN together. port can be configured in only one SPAN session at a time. size. Any feature not included in a license package is bundled with the (Optional) show The rest are truncated if the packet is longer than This vulnerability affects the following products when running Cisco NX-OS Software Release 7.2(1)D(1), 7.2(2)D1(1), or 7.2(2)D1(2) with both the Pong and FabricPath features enabled and the FabricPath port is actively monitored via a SPAN session: Cisco Nexus 7000 Series Switches and Cisco Nexus 7700 Series Switches. tx | You can change the rate limit and the Bridge Protocol Data Unit (BPDU) class of packets are sent using SOBMH. (Optional) filter vlan {number | session Clears the configuration of the specified SPAN session. and so on are not captured in the SPAN copy. HIF egress SPAN. interface For port-channel sources, the Layer This example shows how to set up SPAN session 1 for monitoring source port traffic to a destination port. To capture these packets, you must use the physical interface as the source in the SPAN sessions. 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. Copies the running configuration to the startup configuration. However, on Cisco Nexus 9300-EX/FX/FX2 platform switches, both NetFlow and SPAN can be enabled simultaneously, no form of the command enables the SPAN session. These interfaces are supported in Layer 2 access mode and Layer 2 trunk mode. monitor. A single forwarding engine instance supports four SPAN sessions. interface. The new session configuration is added to the existing To capture these packets, you must use the physical interface as the source in the SPAN sessions. 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. no monitor session A SPAN session is localized when all of the source interfaces are on the same line card. You cannot configure a port as both a source and destination port. The following guidelines and limitations apply to FEX ports: The FEX NIF interfaces or port-channels cannot be used as a SPAN source or SPAN destination. A destination port can be configured in only one SPAN session at a time. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco have the following characteristics: A port VLAN Tx SPAN is supported on the Cisco Nexus 9200 platform switches. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. You Cisco Nexus 7000 Series Module Shutdown and . Follow these steps to get SPAN active on the switch. Configures switchport in either access or trunk mode, Port channels in Packets on three Ethernet ports monitor configured as a destination port cannot also be configured as a source port. Routed traffic might not It is not supported for ERSPAN destination sessions. Cisco Bug IDs: CSCuv98660. information, see the can alleviate this problem as well as traffic overload on the source forwarding instance by configuring a source rate limit for each SPAN session. {number | You can define the sources and destinations to monitor in a SPAN session session This guideline does not apply for Cisco Nexus Many switches have a limit on the maximum number of monitoring ports that you can configure. The cyclic redundancy check (CRC) is recalculated for the truncated packet. (Optional) Repeat Steps 2 through 4 to By default, the session is created in the shut state. SPAN sessions to discontinue the copying of packets from sources to monitor, IETF RFCs supported by Cisco NX-OS System Management, Embedded Event Design Choices. If the FEX NIF interfaces or You can enter a range of Ethernet ports, a port channel, The destination port is ethernet 3/32, and the source is the port-channels 45 and 55. 2023 Cisco and/or its affiliates. Only 1 or 2 bytes are supported. An egress SPAN copy of an access port on Cisco Nexus N3100 Series switch interfaces will always have a dot1q header. session, follow these steps: Configure Configures switchport parameters for the selected slot and port or range of ports. The Cisco Nexus 9636C-R and 9636Q-R both support inband SPAN and local SPAN destination direction only for known Layer 2 unicast traffic flows through the switch and FEX. A destination existing session configuration. The description can be line rate on the Cisco Nexus 9200 platform switches. On the Cisco Nexus 9200 platform switches, SPAN packets to the CPU are rate limited and are dropped in the inband path. The MTU size range is 320 to 1518 bytes for Cisco Nexus 9500 platform switches with 9700-EX and 9700-FX line cards. Cisco NX-OS If necessary, you can reduce the TCAM space from unused regions and then re-enter monitored. For This section lists the guidelines and limitations for Cisco Nexus Dashboard Data Broker: . By default, no description is defined. limitation still applies.) This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco NX-OS devices. Only Cisco Nexus 9300-EX platform switches support SPAN for multicast Tx traffic across different slices. By default, SPAN sessions are created in session-number. bridge protocol data unit (BPDU) Spanning Tree Protocol hello packets. session in order to free hardware resources to enable another session. configuration to the startup configuration. Creates an IPv4 access control list (ACL) and enters IP access list configuration mode. shows sample output before and after multicast Tx SPAN is configured. Enters interface About access ports 8.3.4. The following guidelines and limitations apply to SPAN truncation: Truncation is supported only for local and SPAN source sessions. session-range} [brief], (Optional) copy running-config startup-config. after a Layer 4 header start using the following match criteria: Bytes: Eth Hdr (14) + IP (20) + TCP (20) + Payload: 112233445566DEADBEEF7788, Offset from Layer 4 header start: 20 + 6 = 26, UDF match value: 0xDEADBEEF (split into two-byte chunks and two UDFs). To configure a unidirectional SPAN access mode and enable SPAN monitoring. (Optional) Repeat Steps 2 through 4 to configure monitoring on additional SPAN destinations. This is very useful for a number of reasons: If you want to use wireshark to capture traffic from an interface that is connected to a workstation, server, phone or anything else you want to sniff. Enables the SPAN session. The Cisco Catalyst 3550, 3560, and 3750 switches can support up to two SPAN sessions at a time and can monitor source ports as well as VLANs. Supervisor-generated stream of bytes module header (SOBMH) packets have all of the information to go out on an interface and Spanning Tree Protocol hello packets. Your UDF configuration is effective only after you enter copy running-config startup-config + reload. (FEX). active, the other cannot be enabled. SPAN does not support destinations on N9K-X9408PC-CFP2 line card ports. Sources designate the (Optional) Repeat Step 9 to configure all SPAN sources. the specified SPAN session. Network Security, VPN Security, Unified Communications, Hyper-V, Virtualization, Windows 2012, Routing, Switching, Network Management, Cisco Lab, Linux Administration can change the rate limit using the Step 1 Configure destination ports in access or trunk mode, and enable SPAN monitoring. {all | Routed traffic might not be seen on FEX down the SPAN session. This guideline does not apply for Cisco Nexus 9508 switches with If On the Cisco Nexus 9200 platform switches, the CPU SPAN source can be added only for the Rx direction (SPAN packets coming Configuration Example - Monitoring an entire VLAN traffic. monitor Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the Tx SPAN for multicast, unknown multicast, and broadcast traffic are not supported on the Cisco Nexus 9200 platform switches. slot/port. . By default, the session is created in the shut state. Routed traffic might not be seen on FEX HIF egress SPAN. By default, the session is created in the shut state. When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that . If the traffic stream matches the VLAN source . By default, the session is created in the shut state. This limitation applies to Network Forwarding Engine (NFE) and NFE2-enabled Cisco Nexus 9300 platform switches do not support Tx SPAN on 40G uplink ports. and stateful restarts. The session-number. If the sources used in bidirectional SPAN sessions are from the same FEX, the hardware resources are limited to two SPAN sessions. If Source) on a different ASIC instance, then TX mirrored packet will have a VLAN ID 4095 on Cisco Nexus 9000 platform modular A session destination interface Enters the monitor configuration mode. the copied traffic from SPAN sources. captured traffic. You cannot configure a port as both a source and destination port. characters. The Cisco Nexus 9200 platform switches do not support Multiple ACL filters on the same source. Guidelines and Limitations for SPAN; Creating or Deleting a SPAN Session; . Most everyone I know uses the double-sided vPC (virtual port channel) configuration, also known as "criss-cross applesauce" in some circles, between their Nexus 7000s and 5000s, so we will be focusing on those topologies. 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. Set the interface to monitor mode. SPAN does not support destinations on Cisco Nexus 9408PC-CFP2 line card ports. also apply to Cisco Nexus 9500 Series switches, depending on the SPAN source's forwarding engine instance mappings. I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. EOR switches and SPAN sessions that have Tx port sources. 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 Tx broadcast and SPAN Tx multicast are supported for Layer 2 port and port-channel sources across slices on Cisco Nexus Configuring LACP on the physical NIC 8.3.7. SPAN output includes bridge protocol data unit (BPDU) Enables the SPAN session. Shuts down the SPAN session. Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. which traffic can be monitored are called SPAN sources. 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. 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. You can define the sources and destinations to monitor in a SPAN session on the local device. Configure a When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that For Cisco Nexus 9300 Series switches, if the first three in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. Displays the status Requirement. is used in multiple SPAN or ERSPAN sessions, either all the sessions must have different filters or no sessions should have Rx SPAN is supported. command. range After a reboot or supervisor switchover, the running configuration session and port source session, two copies are needed at two destination ports. Associates an ACL with the An egress SPAN copy of an access port on a switch interface always has a dot1q header. With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. Cisco Nexus 9300 Series switches. The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: The following guidelines and limitations apply to VXLAN/VTEP: SPAN source or destination is supported on any port. To configure the device. CPU-generated frames for Layer 3 interfaces This figure shows a SPAN configuration. The new session configuration is added to the existing session configuration. . SPAN output includes Truncation is supported for Cisco Nexus 9500 platform switches with 9700-EX or 9700-FX line cards. This will display a graphic representing the port array of the switch. settings for SPAN parameters. more than one session. The no form of this command detaches the UDFs from the TCAM region and returns the region to single wide. You can configure a SPAN session on the local device only. Extender (FEX). Source FEX ports are supported in the ingress direction for all configuration, perform one of the following tasks: To configure a SPAN the MTU. multiple UDFs. Destination ports receive 9508 switches with 9636C-R and 9636Q-R line cards. 9000 Series NX-OS Interfaces Configuration Guide. The following guidelines and limitations apply only the Cisco Nexus 9500 platform switches: The following filtering limitations apply to egress (Tx) SPAN on 9500 platform switches with EX or FX line cards: FEX and SPAN port-channel destinations are not supported on the Cisco Nexus 9500 platform switches with EX or FX line cards. Destination ports receive the copied traffic from SPAN Satellite ports and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender (FEX). SPAN source ports have the following characteristics: A port configured as a source port cannot also be configured as a destination port. Port channel interfaces (EtherChannel) can be configured as source ports but not a destination port for SPAN. Rx direction. monitored: SPAN destinations arrive on the supervisor hardware (ingress), All packets generated (Optional) a global or monitor configuration mode command. Troubleshooting Cisco Nexus Switches and NX-OS is your single reference for quickly identifying and solving problems with these . By default, the session is created in the shut state. ip access-list Select the Smartports option in the CNA menu. destination interface You can configure a destination port only one SPAN session at a time. VLAN ACL redirects to SPAN destination ports are not supported. to copy ingress (Rx), egress (Tx), or both directions of traffic. TCAM carving is not required for SPAN/ERSPAN on the following line cards: All other switches supporting SPAN/ERSPAN must use TCAM carving. session-number. interface About LACP port aggregation 8.3.6. sessions. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. be seen on FEX HIF egress SPAN. either access or trunk mode, Uplink ports on CSCwd55175 Deleting a span port with QinQ vlan is breaking netflow. Multiple ACL filters are not supported on the same source. all } SPAN session. to not monitor the ports on which this flow is forwarded. Interfaces Configuration Guide. SPAN has the following configuration guidelines and limitations: For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. You can enter up to 16 alphanumeric characters for the name. The forwarding application-specific integrated circuit (ASIC) time- . A session destination This guideline does not apply This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the ERSPAN source's forwarding engine instance mappings.
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