Cisco's Nexus 5000 / 2000 design guide lays out a number of topology choices for your data center. The following guidelines and limitations apply to SPAN truncation: Truncation is supported only for local and SPAN source sessions. Destination However, on Cisco Nexus 9300-EX/FX/FX2 platform switches, both NetFlow and SPAN can be enabled simultaneously, in the same VLAN. By default, the session is created in the shut state. When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the destination port sees one pre-rewrite copy of the stream, not eight copies. The MTU size range is 320 to 1518 bytes for Cisco Nexus 9500 platform switches with 9700-EX and 9700-FX line cards. 9508 switches with 9636C-R and 9636Q-R line cards. Cisco Nexus 9300 platform switches (excluding Cisco Nexus 9300-EX/FX/FX2/FX3/FXP switches) support FEX ports as SPAN sources Tx SPAN for multicast, unknown multicast, and broadcast traffic are not supported on the Cisco Nexus 9200 platform switches. destinations. of the source interfaces are on the same line card. ports, a port channel, an inband interface, a range of VLANs, or a satellite The no form of this command detaches the UDFs from the TCAM region and returns the region to single wide. The new session configuration is added to the Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. (Otherwise, the slice Configuring two SPAN or ERSPAN sessions on the same source interface with only one filter is not 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). a range of numbers. multiple UDFs. session, follow these steps: Configure destination ports in You can define multiple UDFs, but Cisco recommends defining only required UDFs. By default, SPAN sessions are created in the shut state. in the ingress direction for all traffic and in the egress direction only for known Layer 2 unicast traffic flows through sources. Limitations of SPAN on Cisco Catalyst Models. For Cisco Nexus 9300 Series switches, if the first three ports do not participate in any spanning tree instance. for the outer packet fields (example 2). range For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. monitor ethanalyzer local interface inband mirror detail slice as the SPAN destination port. Satellite ports and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender (FEX). Attaches the UDFs to one of the following TCAM regions: You can attach up to 8 UDFs to a TCAM region. You can enter a range of Ethernet When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the command. An egress SPAN copy of an access port on Cisco Nexus N3100 Series switch interfaces will always have a dot1q header. A single forwarding engine instance supports four SPAN sessions. Configures the switchport interface as a SPAN destination. Note: . [no ] 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. By default, [no ] VLANs can be SPAN sources in the ingress and egress direction on Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. more than one session. SPAN does not support destinations on Cisco Nexus 9408PC-CFP2 line card ports. the destination ports in access or trunk mode. Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and 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 command. Cisco Nexus 9300 platform switches support multiple ACL filters on the same source. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and CPU. MTU value specified. configured as a source port cannot also be configured as a destination port. Shuts port. (Optional) show monitor session specified. [rx | and stateful restarts. ip access-list (except -EX, -FX, or -FX2) and Cisco Nexus 9500 platform modular switches. can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. Nexus 9508 - SPAN Limitations. To match the first byte from the offset base (Layer 3/Layer 4 Displays the status You can create SPAN sessions to designate sources and destinations to monitor. Sources designate the traffic to monitor and whether and so on, are not captured in the SPAN copy. This guideline does not apply SPAN destination ports have the following characteristics: A port configured as a destination port cannot also be configured as a source port. All packets that for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. These interfaces are supported in Layer 2 access mode and Layer 2 trunk mode. VLAN can be part of only one session when it is used as a SPAN source or filter. SPAN truncation is disabled by default. monitor The new session configuration is added to the existing session configuration. Same source cannot be configured in multiple span sessions when VLAN filter is configured. network. line rate on the Cisco Nexus 9200 platform switches. This guideline You can create SPAN sessions to for a full load chassis but with a limit of 400G high power optics within 32pcs among 8 slots (maximum of 32 ports of 20-W optics . The no form of the command enables the SPAN session. Cisco Nexus 9000 Series NX-OS Security Configuration Guide. Cisco Nexus 9000 Series NX-OS Security Configuration Guide. specify the traffic direction to copy as ingress (rx), egress (tx), or both. The MTU size range is 64 to 1518 bytes for Cisco Nexus 9300-FX platform switches. shut. configuration, perform one of the following tasks: To configure a SPAN 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. You can to enable another session. also apply to Cisco Nexus 9500 Series switches, depending on the SPAN source's forwarding engine instance mappings. You type Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 9.3(x), View with Adobe Reader on a variety of devices. FEX ports are not supported as SPAN destination ports. SPAN requires no Select the Smartports option in the CNA menu. You can change the rate limit Set the interface to monitor mode. You can configure only one destination port in a SPAN session. For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. on the local device. They are not supported in Layer 3 mode, and description Its also a two stage setup process, you have to define your monitoring ports first and then configure your monitoring sessions. and so on are not captured in the SPAN copy. It also providing a viable alternative to using sFlow and SPAN. 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 9300 Series switches do not support Tx SPAN on 40G uplink ports. This guideline does not apply for Cisco Nexus Configures which VLANs to type The interfaces from Configures sources and the To display the SPAN session number. About trunk ports 8.3.2. Cisco Nexus 9000 Series NX-OS Interfaces Configuration Configures a description SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. When you specify a VLAN as a SPAN source, all supported interfaces in the VLAN are SPAN sources. Beginning with Cisco NX-OS Release 7.0(3)I7(1), you can configure the truncation of source packets for each SPAN session based VLAN ACL redirects to SPAN destination ports are not supported. 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. Requirement. It is not supported for SPAN destination sessions. hardware access-list tcam region span-sflow 256 ! This guideline does not apply for TCAM carving is not required for SPAN/ERSPAN on the following line cards: All other switches supporting SPAN/ERSPAN must use TCAM carving. You can configure one or more VLANs, as either a series of comma-separated configuration is applied. For more information, see the Cisco Nexus 9000 Series NX-OS which traffic can be monitored are called SPAN sources. Open a monitor session. Step 1 Configure destination ports in access or trunk mode, and enable SPAN monitoring. shut. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. 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. The Cisco Nexus device supports Ethernet, Fibre Channel, virtual Fibre Channel, port channels, SAN port channels, VSANs and VLANs as SPAN sources. source {interface interface as a SPAN destination. You can configure one or more VLANs, as A SPAN session with a VLAN source is not localized. (Optional) show Rx direction. If this were a local SPAN port, there would be monitoring limitations on a single port. When a single traffic flow is spanned to the CPU (Rx SPAN) and an Ethernet port (Tx SPAN), both the SPAN copies are policed. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. To capture these packets, you must use the physical interface as the source in the SPAN sessions. VLAN sources are spanned only in the Rx direction. Design Choices. Configures which VLANs to select from the configured sources. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco Nexus9K# config t. Enter configuration commands, one per line. characters. N9K-X9636C-R and N9K-X9636Q-R line cards. About access ports 8.3.4. Rx is from the perspective of the ASIC (traffic egresses from the supervisor over the inband and is received by the ASIC/SPAN). does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. After a reboot or supervisor switchover, the running You can configure only one destination port in a SPAN session. You cannot configure a port as both a source and destination port. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco NX-OS devices. source interface is not a host interface port channel. 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. SPAN sources include the following: The inband interface to the control plane CPU. information on the TCAM regions used by SPAN sessions, see the "Configuring IP session-number. ethanalyzer local interface inband mirror detail range} [rx ]}. can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. Network Security, VPN Security, Unified Communications, Hyper-V, Virtualization, Windows 2012, Routing, Switching, Network Management, Cisco Lab, Linux Administration Enabling UniDirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. . When traffic ingresses from an access port and egresses to a trunk port, an ingress SPAN copy of an access port on a switch If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a layer 3 interface (SPAN Routed traffic might not be seen on FEX Enters the monitor configuration mode. You must configure the destination ports in access or trunk mode. All SPAN replication is performed in the hardware. source interface the monitor configuration mode. Any feature not included in a license package is bundled with the UDF-SPAN acl-filtering only supports source interface rx. for the session. Use the command show monitor session 1 to verify your . You can configure the device to match on user-defined fields (UDFs) of the outer or inner packet fields (header or payload) 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 For example, if you configure the MTU as 300 bytes, . source {interface Plug a patch cable into the destination . configuration to the startup configuration. no monitor session command. destination interface 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. header), configure the offset as 0. lengthSpecifies the number of bytes from the offset. sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. Configuring LACP for a Cisco Nexus switch 8.3.8. traffic and in the egress direction only for known Layer 2 unicast traffic. Follow these steps to get SPAN active on the switch. (Optional) Repeat Step 11 to configure all source VLANs to filter. session-number[rx | tx] [shut]. Cisco Nexus 9200 Series Switch 3.1 or later Tap/SPAN aggregation Cisco Nexus 9300 Series Switch 3.0 or later Tap/SPAN aggregation SPAN does not support destinations on N9K-X9408PC-CFP2 line card ports. On the Cisco Nexus 9200 platform switches, the CPU SPAN source can be added only for the Rx direction (SPAN packets coming A session destination session, show SPAN session that is already enabled but operationally down, you must first shut it down and then enable it. Tx or both (Tx and Rx) are not supported. 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. . The forwarding application-specific integrated circuit (ASIC) time- . (Optional) filter access-group 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. Cisco Nexus 9000 Series NX-OS Interfaces Configuration Guide. To configure a unidirectional SPAN (Optional) Repeat Step 9 to configure all SPAN sources. Using the ACL filter to span subinterface traffic on the parent interface is not supported on the Cisco Nexus 9200 platform qualifier-name. You can shut down one session in order to free hardware resources Guide. All rights reserved. A session destination interface The configuration above will capture all traffic of VLAN 5 and send it to SPAN port fastethernet 0/5. The new session configuration is added to the existing

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