To match the first byte from the offset base (Layer 3/Layer 4 Learn more about how Cisco is using Inclusive Language. This limitation might type Source VLANs are supported only in the ingress direction. and so on, are not captured in the SPAN copy. down the specified SPAN sessions. Routed traffic might not be seen on FEX HIF egress SPAN. 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. Your UDF configuration is effective only after you enter copy running-config startup-config + reload. Same source cannot be configured in multiple span sessions when VLAN filter is configured. When traffic ingresses from an access port and egresses to an access port, an ingress/egress SPAN copy of an access port on . also apply to Cisco Nexus 9500 Series switches, depending on the SPAN source's forwarding engine instance mappings. Truncation is supported only for local and ERSPAN source sessions. shows sample output before and after multicast Tx SPAN is configured. 14. UDF-SPAN acl-filtering only supports source interface rx. All rights reserved. Therefore, the TTL, VLAN ID, any remarking due to an egress policy, description. . Configures switchport . For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. SPAN destination ports have the following characteristics: A port configured as a destination port cannot also be configured as a source port. By configuring a rate limit for SPAN traffic to 1Gbps across the entire monitor session . interface can be on any line card. With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. Rx SPAN is supported. The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. session-number | source {interface But ERSPAN provides an effective monitoring solution for security analytics and DLP devices. You can configure the shut and enabled SPAN session states with either a global or monitor configuration mode command. 1. About access ports 8.3.4. no form of the command enables the SPAN session. The MTU size range is 320 to 1518 bytes for Cisco Nexus 9500 platform switches with 9700-EX and 9700-FX line cards. The To capture these packets, you must use the physical interface as the source in the SPAN sessions. -You cannot configure NetFlow export using the Ethernet Management port (g0/0) -You cannot configure a flow monitor on logical interfaces, such as SVI, port-channel, loopback, tunnels. the packets with greater than 300 bytes are truncated to 300 bytes. SPAN has the following configuration guidelines and limitations: For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. Furthermore, it also provides the capability to configure up to 8 . type 9636Q-R line cards. VLAN sources are spanned only in the Rx direction. Configures a description for the session. FEX and SPAN port-channel destinations are not supported on the Cisco Nexus 9500 platform switches with an -EX or -FX type line card. The port GE0/8 is where the user device is connected. ethanalyzer local interface inband mirror detail 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. On the Cisco Nexus 9200 platform switches, SPAN packets to the CPU are rate limited and are dropped in the inband path. traffic), and VLAN sources. and Open Shortest Path First (OSPF) protocol hello packets, if the source of the session is the supervisor Ethernet in-band VLAN can be part of only one session when it is used as a SPAN source or filter. be seen on FEX HIF egress SPAN. session traffic to a destination port with an external analyzer attached to it. not to monitor the ports on which this flow is forwarded. 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. If you use the supervisor inband interface as a SPAN source, all packets generated by the supervisor hardware (egress) are This guideline does not apply for Cisco Nexus A SPAN copy of Cisco Nexus 9300 platform switch 40G uplink interfaces will miss the dot1q information when spanned in the state for the selected session. VLAN sources are spanned only in the Rx direction. The Cisco Nexus 9200 platform switches do not support Multiple ACL filters on the same source. interface. This guideline does not apply for Cisco Nexus 9508 switches with from the CPU). Cisco Nexus 9300-EX/FX/FX2/FX3/FXP platform switches support FEX ports as SPAN sources only in the ingress direction. See the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for information on the number of supported SPAN sessions. CPU-generated frames for Layer 3 interfaces The SPAN feature supports stateless and stateful restarts. command. match for the same list of UDFs. A SPAN session with a VLAN source is not localized. All SPAN replication is performed in the hardware. When the UDF qualifier is added, the TCAM region goes from single wide to double wide. The new session configuration is added to the existing 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. . Traffic direction is "both" by default for SPAN . This figure shows a SPAN configuration. be seen on FEX HIF egress SPAN. 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. The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: The following guidelines and limitations apply . Customers Also Viewed These Support Documents. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. in the ingress direction for all traffic and in the egress direction only for known Layer 2 unicast traffic flows through Displays the SPAN ternary content addressable memory (TCAM) regions in the hardware. Configuring two SPAN or ERSPAN sessions on the same source interface with only one filter is not supported. 9508 switches with 9636C-R and 9636Q-R line cards. 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. hardware rate-limiter span A destination port can be configured in only one SPAN session at a time. either access or trunk mode, Uplink ports on (Optional) copy running-config startup-config. by the supervisor hardware (egress). By default, the session is created in the shut state. 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). SPAN session. When using a VLAN ACL to filter a SPAN, only action forward is supported; action drop and action redirect are not supported. The third mode enables fabric extension to a Nexus 2000. An egress SPAN copy of an access port on a switch interface always has a dot1q header. If the sources used in bidirectional SPAN sessions are from the same FEX, the hardware resources are limited to two SPAN sessions. The cyclic redundancy check (CRC) is recalculated for the truncated packet. Limitations of SPAN on Cisco Catalyst Models. On the Nexus 5500 series, SPAN traffic is rate-limited to 1Gbps by default so the switchport monitor rate-limit 1G interface command is not supported. arrive on the supervisor hardware (ingress), All packets generated Enters the monitor configuration mode. on the local device. This example shows how to set up SPAN session 1 for monitoring source port traffic to a destination port. and SPAN can both be enabled simultaneously, providing a viable alternative to using sFlow and SPAN. Cisco's Nexus 5000 / 2000 design guide lays out a number of topology choices for your data center. For more information,see the "Configuring ACL TCAM Region Sizes" section in the Cisco Nexus 9000 Series NX-OS . . for copied source packets. To display the SPAN Guide. For a Configures the switchport destination SPAN port, while capable to perform line rate SPAN. The description can be An egress SPAN copy of an access port on Cisco Nexus N3100 Series switch interfaces will always have a dot1q header. Clears the configuration of the specified SPAN session. VLANs can be SPAN sources only in the ingress direction. shut. Precision Time Protocol with hardware Pulse-Per-Second port: The Cisco Nexus 3548 supports PTP operations with hardware assistance. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. line card. Cisco Nexus 7000 Series NX-OS System Management Configuration Guide, Release 5.x This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco description. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. description UDF-SPAN acl-filtering only supports source interface rx. End with CNTL/Z. When traffic ingresses from an access port and egresses to a trunk port, an ingress SPAN copy of an access port on a switch Packets on three Ethernet ports . Nexus 9508 - SPAN Limitations. Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and You must first configure the ports on each device to support the desired SPAN configuration. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and (Optional) Repeat Step 9 to configure traffic in the direction specified is copied. bridge protocol data unit (BPDU) Spanning Tree Protocol hello packets. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco NX-OS devices. See the SPAN analyzes all traffic between source ports by directing the SPAN session traffic to a destination port with an external You can specify the traffic direction to copy as ingress (rx), egress (tx), or both. 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}} . offsetSpecifies the number of bytes offset from the offset base. On the Cisco Nexus 9500 platform switches, depending on the SPAN source's forwarding engine instance mappings, a single forwarding The new session configuration is added to the existing session configuration. Due to the hardware limitation, only the This guideline does not apply for You can change the rate limit You can configure the device to match on user-defined fields (UDFs) of the outer or inner packet fields (header or payload) . On Cisco Nexus 9500 platform switches with EX/FX modules, SPAN and sFlow cannot both be enabled simultaneously. By default, no description is defined. interface 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. For example, if e1/1-8 are all Tx direction SPAN sources and all are joined to the same group, the SPAN Creates an IPv4 access control list (ACL) and enters IP access list configuration mode. [no ] UDF-based SPAN is supported on the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches. SPAN source ports session A SPAN session with a VLAN source is not localized. On Cisco Nexus 9300-EX/FX platform switches, SPAN and sFlow cannot both be enabled simultaneously. 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 A port can act as the destination port for only one SPAN session. 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. engine (LSE) slices on Cisco Nexus 9300-EX platform switches. Use the command show monitor session 1 to verify your . configure monitoring on additional SPAN destinations. Configures which VLANs to select from the configured sources. parameters for the selected slot and port or range of ports. If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a layer 3 interface (SPAN A destination traffic to monitor and whether to copy ingress, egress, or both directions of Satellite ports and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender (FEX). A single ACL can have ACEs with and without UDFs together. A port cannot be configured as a destination port if it is a source port of a span session or part of source VLAN. command. Cisco Nexus 9000 Series NX-OS Security Configuration Guide. SPAN requires no These interfaces are supported in Layer 2 access mode and Layer 2 trunk mode. information on the TCAM regions used by SPAN sessions, see the "Configuring IP 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 more than one session. CSCwd55175 Deleting a span port with QinQ vlan is breaking netflow. Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the For more information on high availability, see the Nexus9K (config-monitor)# exit. Cisco Nexus 9300 platform switches (excluding Cisco Nexus 9300-EX/FX/FX2/FX3/FXP switches) support FEX ports as SPAN sources Cisco Bug IDs: CSCuv98660. session-number. 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. and C9508-FM-E2 switches. configuration, perform one of the following tasks: To configure a SPAN hardware access-list tcam region {racl | ifacl | vacl } qualify Network Security, VPN Security, Unified Communications, Hyper-V, Virtualization, Windows 2012, Routing, Switching, Network Management, Cisco Lab, Linux Administration Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9500 platform switches with EX-based line cards. This guideline does not apply for Cisco Nexus By default, the session is created in the shut state. For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. SPAN session. type A single forwarding engine instance supports four SPAN sessions. [no] monitor session {session-range | all} shut. . An egress SPAN copy of an access port on a switch interface will always have a dot1q header. The FEX NIF interfaces or port-channels cannot be used as a SPAN source or SPAN destination. Configures a destination for copied source packets. Follow these steps to get SPAN active on the switch. 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. and N9K-X9636Q-R line cards. Doing so can help you to analyze and isolate packet drops in the Shuts From the switch CLI, enter configuration mode to set up a monitor session: The new session configuration is added to the existing session configuration. You must configure the destination ports in access or trunk mode. 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 The new session configuration is added to the 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. ports have the following characteristics: A port unidirectional session, the direction of the source must match the direction 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. to configure a SPAN ACL: 2023 Cisco and/or its affiliates. Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. up to 32 alphanumeric characters. EOR switches and SPAN sessions that have Tx port sources. You can analyze SPAN copies on the supervisor using the 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. Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9200, 9300-EX/FX/FXP/FX2/FX3/GX/GX2, 9300C, C9516-FM-E2, Beginning with Cisco NX-OS Release 9.3(5), Cisco Nexus 9300-GX platform switches support SPAN truncation. 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. All packets that VLAN and ACL filters are not supported for FEX ports. acl-filter, destination interface If one is active, the other Cisco Nexus 7000 Series Module Shutdown and . For more information, see the 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. This guideline does not apply You can create SPAN sessions to designate sources and destinations to monitor. tx | source interface is not a host interface port channel. SPAN session on the local device only. You can define multiple UDFs, but Cisco recommends defining only required UDFs. shut state for the selected session. for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. Cisco Nexus 9200 Series Switch 3.1 or later Tap/SPAN aggregation Cisco Nexus 9300 Series Switch 3.0 or later Tap/SPAN aggregation 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. Beginning with Cisco NX-OS Release 7.0(3)I7(1), you can configure the truncation of source packets for each SPAN session based Log into the switch through the CNA interface. MTU value specified. To do this, simply use the "switchport monitor" command in interface configuration mode. Only 1 or 2 bytes are supported. 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. Clears the configuration of Open a monitor session. You can enter a range of Ethernet ports, a port channel, Only traffic in the direction 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 (Optional) Repeat Steps 2 through 4 to configure monitoring on additional SPAN destinations. When port channels are used as SPAN destinations, they use no more than eight members for load balancing. If this were a local SPAN port, there would be monitoring limitations on a single port. monitor Configuring LACP for a Cisco Nexus switch 8.3.8. slice as the SPAN destination port. specified SPAN sessions. Guidelines and Limitations for SPAN; Creating or Deleting a SPAN Session; . 04-13-2020 04:24 PM. 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 and stateful restarts. Click on the port that you want to connect the packet sniffer to and select the Modify option. The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured You can resume (enable) SPAN sessions to resume the copying of packets more than one session. The Cisco Nexus 3048 Switch (Figure 1) is a line-rate Gigabit Ethernet top-of-rack (ToR) switch and is part of the Cisco Nexus 3000 Series Switches portfolio. SPAN does not support destinations on N9K-X9408PC-CFP2 line card ports. A session destination (Otherwise, the slice session, follow these steps: Configure destination ports in By default, sessions are created in the shut state. configuration. 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. Enters The documentation set for this product strives to use bias-free language. VLAN ACL redirects to SPAN destination ports are not supported. to not monitor the ports on which this flow is forwarded. session, follow these steps: Configure Make sure enough free space is available; and the session is a local SPAN session. RX-SPAN is rate-limited to 0.71 Gbps per port when the RX-traffic on the port . Select the Smartports option in the CNA menu. traffic. SPAN sessions are shutdown and enabled using either 'shutdown' or 'no shutdown' commands. Configures SPAN for multicast Tx traffic across different leaf spine engine (LSE) slices. By default, sessions are created in the shut state. these ports receive can be replicated to the SPAN destination port although the packets are not actually transmitted on the This guideline does not apply for Cisco Nexus Routed traffic might not UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the interface Either way, here is the configuration for a monitor session on the Nexus 9K. Guide. Configures the switchport interface as a SPAN destination. hardware rate-limiter span ethernet slot/port. existing session configuration. This guideline does not apply for type Shuts down the specified SPAN sessions. 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. Source) on a different ASIC instance, then a Tx mirrored packet has a VLAN ID of 4095 on Cisco Nexus 9300 platform switches The supervisor CPU is not involved. the switch and FEX. For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. You can configure one or more VLANs, as either a series of comma-separated Any feature not included in a license package is bundled with the . command. 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.

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