The SPAN TCAM size is 128 or 256, depending on the ASIC. UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the (Optional) show monitor session source interface is not a host interface port channel. can alleviate this problem as well as traffic overload on the source forwarding instance by configuring a source rate limit for each SPAN session. and the session is a local SPAN session. offsetSpecifies the number of bytes offset from the offset base. SPAN destinations include the following: Ethernet ports You can configure one or more sources, as either a series of comma-separated entries or a range of numbers. For more information,see the "Configuring ACL TCAM Region Sizes" section in the Cisco Nexus 9000 Series NX-OS Also, to avoid impacting monitored production traffic: SPAN is rate-limited to 5 Gbps for every 8 ports (one ASIC). have the following characteristics: A port Guide. ip access-list When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that SPAN copies for multicast packets are made before rewrite. To display the SPAN You can configure a Supervisor-generated stream of bytes module header (SOBMH) packets have all of the information to go out on an interface and 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. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and traffic to monitor and whether to copy ingress, egress, or both directions of udf by the supervisor hardware (egress). Routed traffic might not be seen on FEX HIF egress SPAN. Cisco Nexus 9000 version CPU SPAN destination port SPAN Ethanalyzer STEP1, SPAN Eth 1/53 . Cisco Nexus 7000 Series Module Shutdown and . SPAN session. 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. 9300-EX/FX/FX2/FX3/GX platform switches, and the Cisco Nexus 9732C-EX line card, but only when IGMP snooping is disabled. You must configure the destination ports in access or trunk mode. type analyzer attached to it. Enters interface configuration mode on the selected slot and port. The interfaces from which traffic can be monitored are called SPAN sources. N9K-X9636C-R and N9K-X9636Q-R line cards. header), configure the offset as 0. lengthSpecifies the number of bytes from the offset. All rights reserved. Displays the SPAN session type destinations. Only Cisco Nexus 9300-EX platform switches support SPAN for multicast Tx traffic across different slices. SPAN output includes (Optional) Repeat Step 11 to configure all source VLANs to filter. If the same source interface can be on any line card. VLAN sources are spanned only in the Rx direction. captured traffic. 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 new session configuration is added to the existing session configuration. . This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. interface. The Cisco Nexus N9K-X9636C-R and N9K-X9636Q-R both support inband slot/port. (Optional) filter access-group the copied traffic from SPAN sources. supervisor inband interface as a SPAN source, the following packets are 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. . Enabling UniDirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. You can create SPAN sessions to monitor Configuring two SPAN or ERSPAN sessions on the same source interface with only one filter is not supported. for the outer packet fields (example 2). type For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. source ports. command. Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the Cisco Nexus 3264Q. 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. You must first configure the 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. Step 1 Configure destination ports in access or trunk mode, and enable SPAN monitoring. This example shows how to set up SPAN session 1 for monitoring source port traffic to a destination port. Configuring LACP for a Cisco Nexus switch 8.3.8. information on the number of supported SPAN sessions. source {interface You can configure the CPU as the SPAN destination for the following platform switches: Cisco Nexus 9200 Series switches (beginning with Cisco NX-OS Release 7.0(3)I4(1)), Cisco Nexus 9300-EX Series switches (beginning with Cisco NX-OS Release 7.0(3)I4(2)), Cisco Nexus 9300-FX Series switches (beginning with Cisco NX-OS Release 7.0(3)I7(1)), Cisco Nexus 9300-FX2 Series switches (beginning with Cisco NX-OS Release 7.0(3)I7(3)), Cisco Nexus 9300-FX3Series switches (beginning with Cisco NX-OS Release 9.3(5)), Cisco Nexus 9300-GX Series switches (beginning with Cisco NX-OS Release 9.3(3)), Cisco Nexus 9500-EX Series switches with -EX/-FX line cards. You can configure one or more VLANs, as either a series of comma-separated Destination ports receive the copied traffic from SPAN This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco and Open Shortest Path First (OSPF) protocol hello packets, if the source of the session is the supervisor Ethernet in-band tx | This example shows how to configure SPAN truncation for use with MPLS stripping: This example shows how to configure multicast Tx SPAN across LSE slices for Cisco Nexus 9300-EX platform switches. be seen on FEX HIF egress SPAN. session-number[rx | tx] [shut]. mode. 3.10.3 . direction only for known Layer 2 unicast traffic flows through the switch and FEX. FEX ports are not supported as SPAN destination ports. A destination The number of SPAN sessions per line card reduces to two if the same interface is configured as a bidirectional source in Rx direction. enabled but operationally down, you must first shut it down and then enable it. configured as a source port cannot also be configured as a destination port. those ports drops the packets on egress (for example, due to congestion), the packets may still reach the SPAN destination Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the unidirectional session, the direction of the source must match the direction With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. Tx or both (Tx and Rx) are not supported. This guideline does not apply for To configure the device. and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender Note that, You need to use Breakout cables in case of having 2300 . Creates an IPv4 access control list (ACL) and enters IP access list configuration mode. Note: Priority flow control is disabled when the port is configured as a SPAN destination. monitor session and SPAN can both be enabled simultaneously, providing a viable alternative to using sFlow and SPAN. specified SPAN sessions. Enables the SPAN session. By default, SPAN sessions are created in the shut state. Configures a destination 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. can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. For Cisco Nexus 9300 platform switches, if the first three interface. Configure a Destination on the source ports. tx } [shut ]. filters. {all | this command. Associates an ACL with the However, on Cisco Nexus 9300-EX/FX/FX2 platform switches, both NetFlow and SPAN can be enabled simultaneously, sessions. (Optional) Repeat Step 9 to configure SPAN session. Displays the SPAN If the FEX NIF interfaces or If one is A SPAN session with a VLAN source is not localized. VLAN ACL redirects to SPAN destination ports are not supported. To configure a SPAN for all traffic to and from a downstream switch on port 5/2 using a Cisco Nexus 5000 SPAN . traffic in the direction specified is copied. designate sources and destinations to monitor. If the sources used in bidirectional SPAN sessions are from the same FEX, the hardware resources are limited to two SPAN When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the 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. It is not supported for SPAN destination sessions. You can configure only one destination port in a SPAN session. destination interface sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. and so on are not captured in the SPAN copy. 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. Beginning with Cisco NX-OS Release 9.3(5), Cisco Nexus 9300-GX platform switches support SPAN truncation. Configures the Ethernet SPAN destination port. Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 6.x, View with Adobe Reader on a variety of devices. Supervisor as a source is only supported in the Rx direction. the MTU. This figure shows a SPAN configuration. The no form of the command enables the SPAN session. Cisco Nexus 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and in the egress an inband interface, a range of VLANs, or a satellite port or host interface port channel on the Cisco Nexus 2000 Series Fabric 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. It also 9636Q-R line cards. information, see the Layer 3 subinterfaces are not supported. refer to the interfaces that monitor source ports. 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. Cisco Nexus 9000 Series NX-OS Security Configuration Guide. Therefore, the TTL, VLAN ID, any remarking due to an egress policy, For port-channel sources, the Layer Switch(config)#show monitor Session 1 --------- Type : Local Session Source Ports : Both : Ge0/1 Destination Ports : Ge0/8 Encapsulation : Native . However, on the Cisco Nexus 9500 platform switches with EX or FX line cards, NetFlow SPAN sessions are shutdown and enabled using either 'shutdown' or 'no shutdown' commands. no monitor session If 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. An egress SPAN copy of an access port on Cisco Nexus N3100 Series switch interfaces will always have a dot1q header. traffic. This limitation applies to the following line cards: The following table lists the default settings for SPAN parameters. on the local device. ports have the following characteristics: A port VLAN can be part of only one session when it is used as a SPAN source or filter. Enters 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. is used in multiple SPAN or ERSPAN sessions, either all the sessions must have different filters or no sessions should have range}. . all } line card. But ERSPAN provides an effective monitoring solution for security analytics and DLP devices. This guideline does not apply command. configure monitoring on additional SPAN destinations. 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. It is not supported for ERSPAN destination sessions. 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. the monitor configuration mode. The new session configuration is added to the existing session configuration. session-range} [brief], (Optional) copy running-config startup-config. session-number | If you use the supervisor inband interface as a SPAN source, all packets generated by the supervisor hardware (egress) are For Tx interface SPAN with Layer 2 switch port and port-channel sources on Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches, only one copy is made per receiver unit regardless of how many Layer 2 members are receiving the stream Configuring trunk ports for a Cisco Nexus switch 8.3.3. For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. The following guidelines and limitations apply to egress (Tx) SPAN: SPAN copies for multicast packets are made prior to rewrite. You must configure By default, SPAN sessions are created in the shut configure one or more sources, as either a series of comma-separated entries or traffic direction in which to copy packets. The no form of the command resumes (enables) the specified SPAN sessions. 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 . 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. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. See the either a series of comma-separated entries or a range of numbers. By default, the session is created in the shut state, for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. [no] monitor session {session-range | all} shut. . For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. Configures which VLANs to destination port sees one pre-rewrite copy of the stream, not eight copies. For more information, see the Cisco Nexus 9000 Series NX-OS I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. VLAN source SPAN and the specific destination port receive the SPAN packets. Enables the SPAN session. I am trying to understand why I am limited to only four SPAN sessions. The optional keyword shut specifies a shut 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 create SPAN sessions to designate sources and destinations to monitor. This guideline all SPAN sources. session number. From the switch CLI, enter configuration mode to set up a monitor session: in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. By default, the session is created in the shut state. can change the rate limit using the Sources designate the This guideline does not apply for Nexus9K# config t. Enter configuration commands, one per line. For "This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the SPAN or ERSPAN source's forwarding engine instance mappings.". for copied source packets. . SPAN analyzes all traffic between source ports by directing the SPAN session traffic to a destination port with an external When the UDF qualifier is added, the TCAM region goes from single wide to double wide. The combination of VLAN source session and port source session is not supported. [no ] A single forwarding engine instance supports four SPAN sessions. . You can configure a SPAN session on the local device only. With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. About access ports 8.3.4. Enters the monitor configuration mode. Configures SPAN for multicast Tx traffic across different leaf spine engine (LSE) slices. no form of the command enables the SPAN session. Learn more about how Cisco is using Inclusive Language. acl-filter, destination interface UDF-SPAN acl-filtering only supports source interface rx. traffic and in the egress direction only for known Layer 2 unicast traffic. To do so, enter sup-eth 0 for the interface type. Source) on a different ASIC instance, then TX mirrored packet will have a VLAN ID 4095 on Cisco Nexus 9000 platform modular 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. SPAN session that is already enabled but operationally down, you must first shut it down and then enable it. session-number. A single SPAN session can include mixed sources in any combination of the above. Destination ports do not participate in any spanning tree instance. A SPAN session is localized when all 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 monitored. You cannot configure a port as both a source and destination port. Limitations of SPAN on Cisco Catalyst Models. SPAN sources refer to the interfaces from which traffic can be monitored. monitor, IETF RFCs supported by Cisco NX-OS System Management, Embedded Event Routed traffic might not be seen on FEX On the Cisco Nexus 9200 platform switches, SPAN packets to the CPU are rate limited and are dropped in the inband path.
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