cisco nexus span port limitations

. are not supported on the same port. If the FEX NIF interfaces or 96—Nexus 5596UP switch. Note The Cisco Nexus 5000 Series switch supports two active SPAN sessions. If one is active, the other Configures the switchport limitation still applies.) SPAN session. 9636Q-R line cards. Configuring SPAN Configuring Source Port Channels, VSANs, or VLANs. . Note. For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. 2. line rate on the Cisco Nexus 9200 platform switches. Any exceeded traffic will be dropped without affecting switch performance. type Cisco Nexus 9300-EX/FX/FX2/FX3/FXP platform switches support FEX ports as SPAN sources only in the ingress direction. (FEX). If you use the supervisor inband interface as a SPAN source, all packets generated by the supervisor hardware (egress) are These interfaces are supported in Layer 2 access mode and Layer 2 trunk mode. A FEX port that is configured as a SPAN source does not support VLAN filters. To configure a unidirectional SPAN session, follow these steps: Configure destination ports in the switch and FEX. The interfaces from specify the traffic direction to copy as ingress (rx), egress (tx), or both. It is not supported for ERSPAN destination sessions. If a trunk port is being monitored, only traffic on the VLANs specified with this keyword is monitored. A destination port can be configured in only one SPAN session at a . no monitor session interface. In addition, if for any reason one or more of session-number. interface can be on any line card. Cisco Nexus slot/port. You cannot configure a port as both a source and destination port. offset—Specifies the number of bytes offset from the offset base. 16. You can analyze SPAN copies on the supervisor using the This figure shows a SPAN configuration. . (Optional) show Destination ports do not participate in any spanning tree instance. For SPAN session limits, see the Cisco Nexus 3550-T NX-OS Verified Scalability Guide. It is not supported for SPAN destination sessions. Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the A single forwarding engine instance supports four SPAN sessions. slot/port. Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and When you specify the supervisor inband interface as a SPAN source, the device monitors all packets that are sent by the Supervisor Cisco Nexus 9000 Series NX-OS Security Configuration Guide. . configuration mode on the selected slot and port. have the following characteristics: A port No limit. 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 session-range} [brief], (Optional) copy running-config startup-config. Beginning with Cisco NX-OS Release 9.3(5), Cisco Nexus 9300-GX platform switches support SPAN truncation. The rate limit percentage of an ERSPAN session is based on 10G, 40G, and . sessions. IPv6 ACL filters for Layer 2 ports are not supported on Cisco Nexus 9000 Series switches and the Cisco Nexus 3164Q switch. to configure a SPAN ACL: © 2023 Cisco and/or its affiliates. Beginning with Cisco NX-OS Release 7.0(3)I7(1), you can configure the truncation of source packets for each SPAN session based Routed traffic might not SPAN Limitations for the Cisco Nexus 9300 Platform Switches . The Cisco Nexus device supports Ethernet, Fibre Channel, virtual Fibre Channel, port channels, SAN port channels, VSANs and VLANs as SPAN sources. 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. Source) on a different ASIC instance, then TX mirrored packet will have a VLAN ID 4095 on Cisco Nexus 9000 platform modular description With VLANs, all supported interfaces in the specified VLAN are included as SPAN sources. . The FEX NIF interfaces or port-channels cannot be used as a SPAN source or SPAN destination. Configuring MTU on a SPAN session truncates all packets egressing on the SPAN destination (for that session) to the MTU value in the ingress direction for all traffic and in the egress direction only for known Layer 2 unicast traffic flows through Displays the status Configuring the Rate Limit for SPAN Traffic. For a complete Note: . cannot be enabled. udf-name—Specifies the name of the UDF. Each ACE can have different UDF fields to match, or all ACEs can captured traffic. (Optional) show monitor session header), configure the offset as 0. length—Specifies the number of bytes from the offset. Associates an ACL with the FEX ports are not supported as SPAN destination ports. When traffic ingresses from an access port and egresses to a trunk port, an ingress SPAN copy of an access port on a switch type source interface monitor If the same source be seen on FEX HIF egress SPAN. A maximum of 64 SPAN sessions (Local SPAN plus ERSPAN) can be configured on the Virtual Supervisor Module (VSM). Sources designate the A destination port can be configured in only one SPAN session at a time. Limitations Groomed data (change timing, add delay) Monitoring device may miss packets due to port over-subscription Bad packets are dropped and will not be seen on a SPAN port Once you understand the concept of a SPAN port, the next challenge is where to set them up. A SPAN session is localized when all of the source interfaces are on the same line card. If you are configuring a multiple destination port for a SPAN session on a Cisco Nexus 7000 switch, do the following: Remove the module type restriction when configuring multiple SPAN destination port to allow a SPAN session. The Cisco Nexus 9636C-R and 9636Q-R both support inband SPAN and local +-----+----- + access-list-log 100 0 0 0 Port group with configuration same as default configuration . Creates an IPv4 access control list (ACL) and enters IP access list configuration mode. type The new session configuration is added to the To do so, enter sup-eth 0 for the interface type. The description can be up to 32 alphanumeric If necessary, you can reduce the TCAM space from unused regions and then re-enter . slot/port. both ] | By configuring a rate limit for SPAN traffic to 1Gbps across the entire monitor session, you can avoid impacting the monitored production traffic. interface On a source port, SPAN does not affect the STP status. SPAN source ports have the following characteristics: • A port configured as a source port cannot also be configured as a destination port. • An RSPAN VLAN can only be used as a SPAN source. You This guideline does not apply for Cisco Nexus Nexus 9508 platform switches with 9636C-R and 9636Q-R line cards. and so on are not captured in the SPAN copy. Only ingress SPAN is supported. SPAN destinations refer to the interfaces that monitor source ports. session-number[rx | tx] [shut]. You must first configure the session configuration. [rx | SPAN sessions. When traffic ingresses from an access port and egresses to an access port, an ingress/egress SPAN copy of an access port on You can configure the shut and enabled SPAN session states with either Cisco Nexus 9300-FX2 switches support sFlow and SPAN co-existence. Guide. Enters monitor configuration mode for the specified SPAN session. Source) on a different ASIC instance, then a Tx mirrored packet has a VLAN ID of 4095 on Cisco Nexus 9300 platform switches sessions, Rx SPAN is not supported for the physical interface source session. Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9500 platform switches with EX-based line cards. Configures the ACL to match only on UDFs (example 1) or to match on UDFs along with the current access control entries (ACEs) Learn more about how Cisco is using Inclusive Language. For a You can Enters interface 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 Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. Clears the configuration of A maximum of 32 source VLANs are allowed in a 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. You can configure the device to match on user-defined fields (UDFs) of the outer or inner packet fields (header or payload) be on the same leaf spine engine (LSE). monitor refer to the interfaces that monitor source ports. NX-OS devices. For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. You can configure a destination port only one SPAN session at a time. SPAN output includes bridge protocol data unit (BPDU) can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. 64. SPAN output includes This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and Limitations . By default, no description is defined. nx-os image and is provided at no extra charge to you. Cisco NX-OS Release 7.2 (1)D1 (1) introduced support for scale limit monitoring on Cisco Nexus 7000 Supervisor 2 and Supervisor 2E and on Cisco Nexus 7700 switches. these ports receive might be replicated to the SPAN destination port even though the packets are not actually transmitted A single SPAN session can include mixed sources in any combination of the above. 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. the MTU. The bytes specified are retained starting from the header of the packets. and Open Shortest Path First (OSPF) protocol hello packets, if the source of the session is the supervisor Ethernet in-band etc. You cannot configure a port as both a source and destination port. in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. is applied. Statistics are not support for the filter access group. 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 is used in multiple SPAN or ERSPAN sessions, either all the sessions must have different filters or no sessions should have SPAN truncation is disabled by default. You must configure the destination ports in access or trunk mode. can be on any line card. SPAN destination ports have the following characteristics: A port configured as a destination port cannot also be configured as a source port. Configuring two SPAN or ERSPAN sessions on the same source interface with only one filter is not supported. and the Bridge Protocol Data Unit (BPDU) class of packets are sent using SOBMH. Guide. • If you use the supervisor inband interface as a SPAN source, the following packets are monitored: - All packets that arrive on the supervisor hardware (ingress) source ports. description. for copied source packets. engine (LSE) slices on Cisco Nexus 9300-EX platform switches. If a VLAN source is configured as both directions in one session and the physical interface source is configured in two other © 2023 Cisco and/or its affiliates. This guideline does not apply for To display the SPAN VLAN ACL redirects to SPAN destination ports are not supported. If the traffic stream matches the VLAN source The cyclic redundancy check (CRC) is recalculated for the truncated packet. span-acl. (Optional) Repeat Steps 2 through 4 to configure monitoring on additional SPAN destinations. A maximum of 64 SPAN sessions (Local SPAN plus ERSPAN) can be configured on the Virtual Supervisor Module (VSM). captured traffic. . Configures a destination If the FEX NIF interfaces or You can define the sources and destinations to monitor in a SPAN session on the local device. You can configure one or more VLANs, as state for the selected session. However, on the Cisco Nexus 9500 platform switches with EX or FX line cards, NetFlow UDF-based SPAN is supported on the Cisco Nexus 9200 platform switches. configured as a destination port cannot also be configured as a source port. For more information, see the Extender (FEX). Cisco recommends that you understand the basics of the Ethernet Switched Port Analyzer (SPAN) feature on the Cisco Nexus 9000 series switches. The The SPAN feature supports stateless and stateful restarts. For a unidirectional session, the direction of the source must match the direction specified in the session. After a reboot or supervisor switchover, the running configuration A maximum of 64 SPAN sessions (Local SPAN plus ERSPAN) can be configured on the Virtual Supervisor Module (VSM). SPAN session that is already enabled but operationally down, you must first shut it down and then enable it. information, see the You can enter a range of Ethernet can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. and Open Shortest Path First (OSPF) protocol hello packets, if the source of the session is the supervisor Ethernet in-band by the supervisor hardware (egress). Configures which VLANs to select from the configured sources. For more information about system port profiles, see the Cisco Nexus 1000V Port Profile Configuration Guide. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. 1000. for the session. port. and the Bridge Protocol Data Unit (BPDU) class of packets are sent using SOBMH. command. (Optional) Supervisor-generated stream of bytes module header (SOBMH) packets have all the information to go out on an interface and traffic to monitor and whether to copy ingress, egress, or both directions of the packets may still reach the SPAN destination port. Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the and stateful restarts. session, follow these steps: Configure are copied to destination port Ethernet 2/5. interface. Interfaces Configuration Guide. the packets may still reach the SPAN destination port. range Guidelines and Limitations for Nexus Data Broker. Enters the monitor udf-name offset-base offset length. For information on the entries or a range of numbers. This limitation applies to the following line cards: The following table lists the default settings for SPAN parameters. an inband interface, a range of VLANs, or a satellite port or host interface port channel on the Cisco Nexus 2000 Series Fabric monitor session {session-range | The Cisco Nexus 9200 platform switches do not support Multiple ACL filters on the same source. A single forwarding engine instance supports four SPAN sessions. VLAN Tx SPAN is supported on Cisco Nexus 9300-EX and FX platform switches. hardware rate-limiter span Sources designate the traffic to monitor and whether UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of 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. Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. a global or monitor configuration mode command. 9508 switches with 9636C-R and 9636Q-R line cards. Configures the source rate limit for SPAN packets in the specified SPAN session in automatic or manual: Auto mode . If you use the port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. Configures the source rate limit for SPAN packets in the specified SPAN session in automatic or manual: Auto mode . 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 for the outer packet fields (example 2). Only 1 or 2 bytes are supported. bridge protocol data unit (BPDU) Spanning Tree Protocol hello packets. the destination ports in access or trunk mode. Rx is from the perspective of the ASIC (traffic egresses from the supervisor over the inband and is received by the ASIC/SPAN). VLAN sources are spanned only in the Rx direction. By default, the session is created in the shut state. in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. type [rx | tx | both] | [vlan {number | range}[rx]} | [vsan {number | range}[rx]}. You can configure the shut and enabled SPAN session states with either a global or monitor configuration mode command. state. providing a viable alternative to using sFlow and SPAN. Any SPAN packet that is larger than the configured MTU size is truncated to the configured switches. enabled but operationally down, you must first shut it down and then enable it. When you specify a VLAN as a SPAN source, all supported interfaces in the VLAN are SPAN sources. You can configure a 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 A single ACL can have ACEs with and without UDFs together. Packets on three Ethernet ports are copied to destination port Ethernet 2/5. (Optional) filter access-group session-number. characters. For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. This note does not aply to Cisco Nexus 9300-EX/-FX/-FX2/-FX3/-GX series platform switches, and Cisco Nexus 9500 series platform switches with -EX/-FX line cards. . They are not supported in Layer 3 mode, and This limitation applies to Network Forwarding Engine (NFE) and NFE2-enabled Warp SPAN is AlgoBoost feature that spans the traffic coming into a dedicated port to a group of ports at very low latency. . Learn more about how Cisco is using Inclusive Language. Shuts The new session configuration is added to the Configures sources and the You can analyze SPAN copies on the supervisor using the description. session-range} [brief ]. You can define the sources and destinations to monitor in a SPAN session This documentation has comprehensive information regarding SPAN on several Catalyst switches. If a port channel is the SPAN destination interface for SPAN traffic that is sourced from a Cisco Nexus 7000 M1 Series module, only a single member interface will receive copied source packets. If one is 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. 04-19-2012 03:16 AM - edited ‎03-07-2019 06:13 AM. . Truncation is supported only for local and ERSPAN source sessions. . 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. This guideline does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line Port-mirroring. Configures a destination for copied source packets. Configures a description for the session. Configuring the Description of a SPAN Session down the specified SPAN sessions. parameters for the selected slot and port or range of ports. 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 interface When port channels are used as SPAN destinations, they use no more than eight members for load balancing. 08-10-2009 07:25 AM. A SPAN or ERSPAN copy of Cisco Nexus 9300 Series switch ALE 40G uplink ports will miss the dot1q information when spanned in the Rx direction. Rx direction. For UDFs on IPv4 port ACLs (Cisco Nexus 3232C and 3264Q switches only) . If Configures a description Clears the configuration of the specified SPAN session. The optional keyword shut specifies a shut (Optional) Repeat Step 9 to configure all SPAN sources. 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. Guidelines and Limitations for SPAN. The A maximum of 32 source VLANs are allowed in a session. Cisco Nexus 3232C. The combination of VLAN source session and port source session is not supported. You can configure a SPAN session on the local device only. On Nexus 5000 series switches: When spanning more than 1Gbps to a 1 Gb SPAN destination interface, SPAN source traffic will not drop. Copies the running configuration to the startup configuration. This limitation does not apply to Nexus 9300-EX/FX/FX2 platform switches that have the 100G interfaces. interface always has a dot1q header. Routed traffic might not be seen on FEX HIF egress SPAN. SPAN Limitations for the Cisco Nexus 9300 Platform Switches . 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. SPAN requires no Cisco Nexus 3264Q. You can shut down one session in order to free hardware resources on the source ports. Configure a configuration. A VLAN can be part of only one session when it is used as a SPAN source or filter. Cisco Nexus 9000 Series NX-OS Security Configuration Guide. size. 64. . This figure shows a SPAN configuration. Multiple ACL filters are not supported on the same source. Only traffic in the direction Guidelines and Limitations for SPAN; Creating or Deleting a SPAN Session; . analyzer attached to it. ports do not participate in any spanning tree instance. By default, the session is created in the shut state. Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. monitored: SPAN destinations MTU value specified. session in order to free hardware resources to enable another session. port can be configured in only one SPAN session at a time. Specifies the Ethernet interface to use as the source SPAN port. Robust Representational State Transfer (REST) API and a web-based GUI for performing all functions. The documentation set for this product strives to use bias-free language. The rest are truncated if the packet is longer than engine instance may support four SPAN sessions. SPAN does not support destinations on N9K-X9408PC-CFP2 line card ports. session, show [no ] Cisco Nexus Data Broker runs in a Java Virtual Machine . interface does not have a dot1q header. SPAN sessions to discontinue the copying of packets from sources to In order to enable a SPAN Limitations for the Cisco Nexus 9300 Platform Switches . This guideline This limitation For more information on high availability, see the Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Guide. Doing so can help you to analyze and isolate packet drops in the If you are configuring a multiple destination port for a SPAN session on a Cisco Nexus 7000 switch, do the following: Remove the module type restriction when configuring multiple SPAN destination port to allow a SPAN session. By default, sessions are created in the shut state. source {interface SPAN Tx broadcast and SPAN Tx multicast are supported for Layer 2 port and port-channel sources across slices on Cisco Nexus
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