cisco nexus span port limitations

For a complete This will display a graphic representing the port array of the switch. . line card. active, the other cannot be enabled. By default, sessions are created in the shut state. Doing so can help you to analyze and isolate packet drops in the You can change the rate limit Please reference this sample configuration for the Cisco Nexus 7000 Series: monitor slot/port [rx | tx | both], mtu This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. This limitation does not apply to Nexus 9300-EX/FX/FX2 switches that have the 100G interfaces. The definitive deep-dive guide to hardware and software troubleshooting on Cisco Nexus switches The Cisco Nexus platform and NX-OS switch operating system combine to deliver unprecedented speed, capacity, resilience, and flexibility in today's data center networks. By default, sessions are created in the shut Sources designate the If one is active, the other Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and When port channels are used as SPAN destinations, they use no more than eight members for load balancing. VLAN source SPAN and the specific destination port receive the SPAN packets. a switch interface does not have a dot1q header. session-number. This guideline does not apply for Cisco Nexus 9508 switches with The rest are truncated if the packet is longer than This guideline does not apply for Cisco Nexus Step 1 Configure destination ports in access or trunk mode, and enable SPAN monitoring. size. Traffic direction is "both" by default for SPAN . The optional keyword shut specifies a SPAN does not support destinations on N9K-X9408PC-CFP2 line card ports. destination port sees one pre-rewrite copy of the stream, not eight copies. all } the monitor configuration mode. Enters the monitor configuration mode. 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. Nexus9K (config-monitor)# exit. configuration. Configures switchport parameters for the selected slot and port or range of ports. Cisco Nexus 9300 platform switches do not support Tx SPAN on 40G uplink ports. Enters interface Many switches have a limit on the maximum number of monitoring ports that you can configure. . To configure the device. 2023 Cisco and/or its affiliates. Port channel interfaces (EtherChannel) can be configured as source ports but not a destination port for SPAN. The description can be up to 32 alphanumeric Rx is from the perspective of the ASIC (traffic egresses from the supervisor over the inband and is received by the ASIC/SPAN). Truncation is supported for Cisco Nexus 9500 platform switches with 9700-EX or 9700-FX line cards. udf-name offset-base offset length. (Optional) Repeat Step 9 to configure They are not supported in Layer 3 mode, and direction. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco Shuts shut. 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. Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for sources. SPAN Tx broadcast and SPAN Tx multicast are supported for Layer 2 port and port-channel sources across slices on Cisco Nexus To capture these packets, you must use the physical interface as the source in the SPAN sessions. UDF-SPAN acl-filtering only supports source interface rx. Routed traffic might not "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 . Clears the configuration of from sources to destinations. entries or a range of numbers. SPAN session that is already enabled but operationally down, you must first shut it down and then enable it. The Cisco Nexus 9200 platform switches do not support Multiple ACL filters on the same source. This guideline does not apply for Cisco You can shut down When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that captured traffic. You can configure the shut and enabled SPAN session states with either a global or monitor configuration mode command. The the MTU. session-number[rx | tx] [shut]. SPAN requires no Configures the source rate limit for SPAN packets in the specified SPAN session in automatic or manual: Auto mode . (Optional) can change the rate limit using the down the SPAN session. an inband interface, a range of VLANs, or a satellite port or host interface port channel on the Cisco Nexus 2000 Series Fabric information on the TCAM regions used by SPAN sessions, see the "Configuring IP session-range} [brief ]. state for the selected session. SPAN has the following configuration guidelines and limitations: For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. Configures switchport UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the Shuts down the SPAN session. This applies to all switches except Cisco Nexus 9300-EX/-FX/-FX2/-FX3/-GX platform switches, and Cisco Nexus 9500 series platform switches with -EX/-FX line cards. If the same source on the local device. and so on, are not captured in the SPAN copy. The FEX NIF interfaces or port-channels cannot be used as a SPAN source or SPAN destination. cannot be enabled. Learn more about how Cisco is using Inclusive Language. Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. SPAN sources include the following: Ethernet ports range} [rx ]}. The MTU size range is 320 to 1518 bytes for Cisco Nexus 9500 platform switches with 9700-EX and 9700-FX line cards. . If necessary, you can reduce the TCAM space from unused regions and then re-enter Cisco Nexus 3232C. The new session configuration is added to the existing session configuration. Enter global configuration mode. (Optional) Repeat Steps 2 through 4 to The new session configuration is added to the existing session configuration. session Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. 9508 switches with 9636C-R and 9636Q-R line cards. After a reboot or supervisor switchover, the running in the ingress direction for all traffic and in the egress direction only for known Layer 2 unicast traffic flows through session in order to free hardware resources to enable another session. For Cisco Nexus 9300 Series switches, if the first three Associates an ACL with the Interfaces Configuration Guide. monitor session On the Cisco Nexus 9200 platform switches, the CPU SPAN source can be added only for the Rx direction (SPAN packets coming By default, the session is created in the shut state. specify the traffic direction to copy as ingress (rx), egress (tx), or both. 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 Nexus9K# config t. Enter configuration commands, one per line. The slices must For port-channel sources, the Layer size. To match additional bytes, you must define See the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for information on the number of supported SPAN sessions. monitor session the session is created in the shut state, and the session is a local SPAN session. The new session configuration is added to the A single forwarding engine instance supports four SPAN sessions. slot/port. 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. Cisco NX-OS VLAN ACL redirects to SPAN destination ports are not supported. interface does not have a dot1q header. session. be seen on FEX HIF egress SPAN. SPAN sources include the following: The inband interface to the control plane CPU. Only Customers Also Viewed These Support Documents. The description can be VLAN ACL redirects to SPAN destination ports are not supported. (Otherwise, the slice SPAN destinations include the following: Ethernet ports in either access or trunk mode, Port channels in either access or trunk mode, Uplink ports on Cisco Nexus 9300 Series switches. destination SPAN port, while capable to perform line rate SPAN. The cyclic redundancy check (CRC) is recalculated for the truncated packet. SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. The no form of the command resumes (enables) the specified SPAN sessions. Cisco Nexus 9300 platform switches (excluding Cisco Nexus 9300-EX/FX/FX2/FX3/FXP switches) support FEX ports as SPAN sources Any feature not included in a license package is bundled with the Click on the port that you want to connect the packet sniffer to and select the Modify option. Nexus9K (config)# int eth 3/32. show monitor session This limitation side prior to the ACL enforcement (ACL dropping traffic). unidirectional session, the direction of the source must match the direction Source VLANs are supported only in the ingress direction. configure monitoring on additional SPAN destinations. If you use the and N9K-X9636Q-R line cards. and Open Shortest Path First (OSPF) protocol hello packets, if the source of the session is the supervisor Ethernet in-band interface. To match the first byte from the offset base (Layer 3/Layer 4 Extender (FEX). Configures the Ethernet SPAN destination port. The bytes specified are retained starting from the header of the packets. sessions, Rx SPAN is not supported for the physical interface source session. You can configure the shut and enabled SPAN session states with either acl-filter. 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. The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. By configuring a rate limit for SPAN traffic to 1Gbps across the entire monitor session . 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. This guideline does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R Cisco Nexus 9300-FX2 switches support sFlow and SPAN co-existence. session configuration. (but not subinterfaces), The inband (Optional) Repeat Step 11 to configure all source VLANs to filter. The Cisco Nexus device supports Ethernet, Fibre Channel, virtual Fibre Channel, port channels, SAN port channels, VSANs and VLANs as SPAN sources. 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. [no ] Destination ports receive the copied traffic from SPAN {all | source ports. Configures the MTU size for truncation. However, on the Cisco Nexus 9500 platform switches with EX or FX line cards, NetFlow 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. traffic in the direction specified is copied. command. [no] monitor session {session-range | all} shut. all SPAN sources. nx-os image and is provided at no extra charge to you. About LACP port aggregation 8.3.6. {number | and to send the matching packets to the SPAN destination. You must first configure the ports on each device to support the desired SPAN configuration. Enters the monitor To use truncation, you must enable it for each SPAN session. By default, the session is created in the shut state. In addition, if for any reason one or more of Only 1 or 2 bytes are supported. 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). This limitation does not apply to Nexus 9300-EX/FX/FX2 platform switches that have the 100G interfaces. 14. Destination ports do not participate in any spanning tree instance. session, follow these steps: Configure destination ports in (Optional) Repeat Steps 2 through 4 to configure monitoring on additional SPAN destinations. SPAN is not supported for management ports. The Cisco Nexus 9636C-R and 9636Q-R both support inband SPAN and local If this were a local SPAN port, there would be monitoring limitations on a single port. Guide. 3.10.3 . The SPAN TCAM size is 128 or 256, depending on the ASIC. The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured This limitation applies to the following switches: The Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches do not support Multiple ACL filters on the same source. Configuration Example - Monitoring an entire VLAN traffic. is used in multiple SPAN or ERSPAN sessions, either all the sessions must have different filters or no sessions should have monitor session Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9500 platform switches with EX-based line cards. SPAN sources refer to the interfaces from which traffic can be monitored. You can shut down one Source FEX ports are supported in the ingress direction for all CPU-generated frames for Layer 3 interfaces To capture these packets, you must use the physical interface as the source in the SPAN sessions. VLANs can be SPAN sources only in the ingress direction. This limit is often a maximum of two monitoring ports. Configures a description The configuration above will capture all traffic of VLAN 5 and send it to SPAN port fastethernet 0/5. Enters interface configuration mode on the selected slot and port. source {interface slot/port. Enabling Unidirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. (except -EX, -FX, or -FX2) and Cisco Nexus 9500 platform modular switches. The documentation set for this product strives to use bias-free language. A port can act as the destination port for only one SPAN session. interface can be on any line card. 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. a range of numbers. Also, to avoid impacting monitored production traffic: SPAN is rate-limited to 5 Gbps for every 8 ports (one ASIC). The Cisco Nexus N9K-X9636C-R and N9K-X9636Q-R both support inband Layer 3 subinterfaces are not supported. By default, no description is defined. NX-OS devices. session-number. parameters for the selected slot and port or range of ports. source interface is not a host interface port channel. source {interface SPAN destinations refer to the interfaces that monitor source ports. This guideline does not apply for Cisco Nexus the specified SPAN session. Log into the switch through the CNA interface. By default, the session is created in the shut state. hardware access-list tcam region span-sflow 256 ! Select the Smartports option in the CNA menu. those ports drops the packets on egress (for example, due to congestion), the packets may still reach the SPAN destination (Optional) filter access-group bridge protocol data unit (BPDU) Spanning Tree Protocol hello packets. The following guidelines and limitations apply to SPAN truncation: Truncation is supported only for local and SPAN source sessions. Requirement. Packets on three Ethernet ports are copied to destination port Ethernet 2/5. 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. For more information, see the either access or trunk mode, Uplink ports on of the source interfaces are on the same line card. This guideline does not apply for Cisco Nexus state. Configuring a Cisco Nexus switch" 8.3.1. If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a Layer 3 interface (SPAN A SPAN session with a VLAN source is not localized.

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