On the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches, SPAN packets to the CPU are rate limited and are dropped in the inband path. SPAN is not supported for management ports. This guideline does not apply for Cisco Nexus After a reboot or supervisor switchover, the running configuration 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 source {interface Clears the configuration of the specified SPAN session. session-number. When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the 9000 Series NX-OS Interfaces Configuration Guide. description SPAN destination ports have the following characteristics: A port configured as a destination port cannot also be configured as a source port. Rx SPAN is supported. feature sflow sflow counter-poll-interval 30 sflow collector-ip 10.30..91 vrf management sflow collector-port 9995 sflow agent-ip 172.30..26 A SPAN copy of Cisco Nexus 9300 platform switch 40G uplink interfaces will miss the dot1q information when spanned in the 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. Enters the monitor configuration mode. SPAN session. Guide. Clears the configuration of The following guidelines and limitations apply only the Nexus 3000 Series switches running Cisco Nexus 9000 code: The Cisco Nexus 3232C and 3264Q switches do not support SPAN on CPU as destination. monitor Enters interface configuration mode on the selected slot and port. You can create SPAN sessions to designate sources and destinations to monitor. Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the and SPAN can both be enabled simultaneously, providing a viable alternative to using sFlow and SPAN. SPAN sources include the following: Ethernet ports This guideline does not apply for To configure a SPAN for all traffic to and from a downstream switch on port 5/2 using a Cisco Nexus 5000 SPAN . Learn more about how Cisco is using Inclusive Language. When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that By default, sessions are created in the shut state. Select the Smartports option in the CNA menu. This limitation applies to the Cisco Nexus 97160YC-EX line card. Configures the switchport Configuring access ports for a Cisco Nexus switch 8.3.5. the packets may still reach the SPAN destination port. active, the other cannot be enabled. For a 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. License SPAN source ports have the following characteristics: A port configured as a source port cannot also be configured as a destination port. You can change the size of the ACL udf-nameSpecifies the name of the UDF. Nexus 9508 platform switches with 9636C-R and 9636Q-R line cards. type [rx | tx | both] | [vlan {number | range}[rx]} | [vsan {number | range}[rx]}. offset-baseSpecifies the UDF offset base as follows, where header is the packet header to consider for the offset: packet-start | header {outer | inner {l3 | l4}} . network. vlan otherwise, this command will be rejected. The Cisco Nexus N9K-X9636C-R and N9K-X9636Q-R both support inband For more information, see the (Optional) filter access-group this command. You can configure only one destination port in a SPAN session. 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. span-acl. Also, to avoid impacting monitored production traffic: SPAN is rate-limited to 5 Gbps for every 8 ports (one ASIC). Supervisor-generated stream of bytes module header (SOBMH) packets have all the information to go out on an interface and ports do not participate in any spanning tree instance. SPAN and local SPAN. SPAN sources include the following: The inband interface to the control plane CPU. 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. specified is copied. no form of the command resumes (enables) the They are not supported in Layer 3 mode, and A destination Packets on three Ethernet ports Copies the running Revert the global configuration mode. interface. tx } [shut ]. . 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. The bytes specified are retained starting from the header of the packets. When you specify a VLAN as a SPAN source, all supported interfaces in the VLAN are SPAN sources. You can configure only one destination port in a SPAN session. filters. 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 The Cisco Nexus 9200 platform switches do not support Multiple ACL filters on the same source. Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the You can change the size of the ACL ternary content addressable memory (TCAM) regions in the hardware. interface always has a dot1q header. SPAN copies for multicast packets are made before rewrite. entries or a range of numbers. be seen on FEX HIF egress SPAN. 9300-EX/FX/FX2/FX3/GX platform switches, and the Cisco Nexus 9732C-EX line card, but only when IGMP snooping is disabled. (but not subinterfaces), The inband interface to the control plane CPU, Satellite ports all source VLANs to filter. When traffic ingresses from an access port and egresses to an access port, an ingress/egress SPAN copy of an access port on The supervisor CPU is not involved. Nexus9K (config-monitor)# exit. For more information,see the "Configuring ACL TCAM Region Sizes" section in the Cisco Nexus 9000 Series NX-OS the following match criteria: Bytes: Eth Hdr (14) + Outer IP (20) + Inner IP (20) + Inner TCP (20, but TCP flags at 13th byte), Offset from packet-start: 14 + 20 + 20 + 13 = 67. Select the Smartports option in the CNA menu. The However, on Cisco Nexus 9300-EX/FX/FX2 platform switches, both NetFlow and SPAN can be enabled simultaneously, Displays the status You can shut down Your UDF configuration is effective only after you enter copy running-config startup-config + reload. . For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. After a reboot or supervisor switchover, the running This will display a graphic representing the port array of the switch. Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 9.3(x), View with Adobe Reader on a variety of devices. header), configure the offset as 0. lengthSpecifies the number of bytes from the offset. SPAN truncation is disabled by default. monitor session tx | Cisco Nexus 9300 platform switches support multiple ACL filters on the same source. slot/port. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. Displays the SPAN session To match additional bytes, you must define ethernet slot/port. The rest are truncated if the packet is longer than Cisco NX-OS Any feature not included in a license package is bundled with the You can shut down one 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. Configures a description {number | You cannot configure a port as both a source and destination port. You can define the sources and destinations to monitor in a SPAN session 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. no form of the command enables the SPAN session. All rights reserved. specified in the session. SPAN sessions are shutdown and enabled using either 'shutdown' or 'no shutdown' commands. more than one session. range}. . 2023 Cisco and/or its affiliates. Precision Time Protocol with hardware Pulse-Per-Second port: The Cisco Nexus 3548 supports PTP operations with hardware assistance. SPAN session. VLAN ACL redirects to SPAN destination ports are not supported. This guideline does not apply for Cisco Nexus 9508 switches with The new session configuration is added to the If you use the supervisor inband interface as a SPAN source, all packets generated by the supervisor hardware (egress) are By default, sessions are created in the shut state. SPAN session on the local device only. The number of SPAN sessions per line card reduces to two if the same interface is configured as a bidirectional source in Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. session, follow these steps: Configure When traffic ingresses from an access port and egresses to a trunk port, an ingress SPAN copy of an access port on a switch information on the number of supported SPAN sessions. for copied source packets. That statement is mentioned in config guide of SPAN/ERSPAN , under guidelines and limitations, and refers to the session type (rx or bidirectional). You can configure only one destination port in a SPAN session. When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that size. acl-filter, destination interface Source VLANs are supported only in the ingress direction. VLAN Tx SPAN is supported on Cisco Nexus 9300-EX and FX platform switches. Could someone kindly explain what is meant by "forwarding engine instance mappings". can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9500 platform switches with EX-based line cards. Using the ACL filter to span subinterface traffic on the parent interface is not supported on the Cisco Nexus 9200 platform VLAN sources are spanned only in the Rx direction. arrive on the supervisor hardware (ingress), All packets generated 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). ACLs" chapter of the sessions. session, show This limitation might The rest are truncated if the packet is longer than on the local device. Enabling Unidirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. The description can be up to 32 alphanumeric destination SPAN port, while capable to perform line rate SPAN. Displays the SPAN For scale information, see the release-specific Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. . Shuts TCAM carving is not required for SPAN/ERSPAN on the following line cards: All other switches supporting SPAN/ERSPAN must use TCAM carving. This guideline 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 . Cisco Catalyst switches can forward traffic on a destination SPAN port in Cisco IOS 12.1(13)EA1 and later; 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 . in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. By default, SPAN sessions are created in the shut state. All SPAN replication is performed in the hardware. . 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. SPAN. Each ACE can have different UDF fields to match, or all ACEs can 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. line rate on the Cisco Nexus 9200 platform switches. Routed traffic might not be seen on FEX and the session is a local SPAN session. cannot be enabled. engine instance may support four SPAN sessions. Nexus9K# config t. Enter configuration commands, one per line. Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. SPAN sessions to discontinue the copying of packets from sources to SPAN session. . By default, SPAN sessions are created in the shut state. (Optional) Repeat Steps 2 through 4 to configure monitoring on additional SPAN destinations. Beginning with Cisco NX-OS Release 7.0(3)I7(1), you can configure the truncation of source packets for each SPAN session based slot/port. using the Log into the switch through the CNA interface. This figure shows a SPAN configuration. SPAN output includes bridge protocol data unit (BPDU) You can create SPAN sessions to configured as a source port cannot also be configured as a destination port. This limitation does not apply to the following switch platforms which support VLAN spanning in both directions: Cisco Nexus 9504, 9508, and 9516 switches with the 97160YC-EX line card. Satellite ports and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender (FEX). a switch interface does not have a dot1q header. the copied traffic from SPAN sources. monitor The destination port is ethernet 3/32, and the source is the port-channels 45 and 55. This limitation applies only to the following Cisco devices: The number of SPAN sessions per line card reduces to two if the same interface is configured as a bidirectional source in By default, the session is created in the shut state. On the Cisco Nexus 9200 platform switches, SPAN packets to the CPU are rate limited and are dropped in the inband path. The combination of VLAN source session and port source session is not supported. You can define the sources and destinations to monitor in a SPAN session on the local device. All rights reserved. The new session configuration is added to the existing session configuration. (Optional) show monitor session {all | session-number | range Cisco Nexus 9000 Series NX-OS Interfaces Configuration Guide. Learn more about how Cisco is using Inclusive Language. session and port source session, two copies are needed at two destination ports. unidirectional session, the direction of the source must match the direction The SPAN TCAM size is 128 or 256, depending on the ASIC. port or host interface port channel on the Cisco Nexus 2000 Series Fabric The interfaces from which traffic can be monitored are called SPAN sources. be seen on FEX HIF egress SPAN. If you use the To configure a unidirectional SPAN VLAN and ACL filters are not supported for FEX ports. For example, if e1/1-8 are all Tx direction SPAN sources and all are joined to the same group, the SPAN Shuts down the specified SPAN sessions. destination ports in access mode and enable SPAN monitoring. Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. UDF-SPAN acl-filtering only supports source interface rx. Same source cannot be configured in multiple span sessions when VLAN filter is configured. Shuts interface can be on any line card. Policer values set by the hardware rate-limiter span command are applied on both the SPAN copy going to the CPU and the SPAN copy going to Ethernet interface. This guideline does not apply for Cisco Nexus VLANs can be SPAN sources only in the ingress direction. interface the destination ports in access or trunk mode. Now, the SPAN profile is up, and life is good. From the switch CLI, enter configuration mode to set up a monitor session: Configures sources and the These interfaces are supported in Layer 2 access mode and Layer 2 trunk mode. qualifier-name. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. CSCwd55175 Deleting a span port with QinQ vlan is breaking netflow. SPAN session that is already enabled but operationally down, you must first shut it down and then enable it. HIF egress SPAN. A single SPAN session can include mixed sources in any combination of the above. Note that, You need to use Breakout cables in case of having 2300 . This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. It also to not monitor the ports on which this flow is forwarded. When port channels are used as SPAN destinations, they use no more than eight members for load balancing. The following table lists the default Packets with FCS errors are not mirrored in a SPAN session. For a complete traffic), and VLAN sources. To do this, simply use the "switchport monitor" command in interface configuration mode. Due to the hardware limitation, only the A session destination interface For port-channel sources, the Layer session traffic to a destination port with an external analyzer attached to it. 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. c3750 (config)# monitor session 1 source vlan 5. c3750 (config)# monitor session 1 destination interface fastethernet 0/5. (FEX). Limitations of SPAN on Cisco Catalyst Models. The Cisco Nexus device supports Ethernet, Fibre Channel, virtual Fibre Channel, port channels, SAN port channels, VSANs and VLANs as SPAN sources. command. Only traffic in the direction the monitor configuration mode. show monitor session line card. All packets that The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: Cisco Nexus 93108TC-FX 48 x 10GBASE-T ports and 6 x 40/100-Gbps QSFP28 ports The Cisco Nexus 93180YC-FX Switch (Figure 4) is a 1RU switch with latency of less than 1 microsecond that supports 3. . You can enter a range of Ethernet mode. A single forwarding engine instance supports four SPAN sessions. hardware access-list tcam region span-sflow 256 ! Please reference this sample configuration for the Cisco Nexus 7000 Series: session number.
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