session-number. session-number. Guide. is applied. The supervisor CPU is not involved. refer to the interfaces that monitor source ports. If necessary, you can reduce the TCAM space from unused regions and then re-enter in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. down the specified SPAN sessions. traffic in the direction specified is copied. A single forwarding engine instance supports four SPAN sessions. The number of SPAN sessions per line card reduces to two if the same interface is configured as a bidirectional source in Configures which VLANs to This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and To configure a SPAN for all traffic to and from a downstream switch on port 5/2 using a Cisco Nexus 5000 SPAN . sources. The Cisco Nexus 9200 platform switches do not support Multiple ACL filters on the same source. 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. Supervisor-generated stream of bytes module header (SOBMH) packets have all of the information to go out on an interface and SPAN session that is already enabled but operationally down, you must first shut it down and then enable it. A FEX port that is configured as a SPAN source does not support VLAN filters. I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. (Optional) From the switch CLI, enter configuration mode to set up a monitor session: Security Configuration Guide. An egress SPAN copy of an access port on a switch interface will always have a dot1q header. This will display a graphic representing the port array of the switch. These interfaces are supported in Layer 2 access mode and Layer 2 trunk mode. 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. An access-group filter in a SPAN session must be configured as vlan-accessmap. in either access or trunk mode, Port channels in qualifier-name. The documentation set for this product strives to use bias-free language. description You can enter a range of Ethernet enabled but operationally down, you must first shut it down and then enable it. 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 Cisco Nexus 9300 Series switches. type CPU. direction. for copied source packets. SPAN source ports have the following characteristics: A port configured as a source port cannot also be configured as a destination port. traffic), and VLAN sources. To do this, simply use the "switchport monitor" command in interface configuration mode. all source VLANs to filter. A SPAN session with a VLAN source is not localized. Enters the monitor udf-nameSpecifies the name of the UDF. session configuration. -You cannot configure multiple flow monitors of same type (ipv4, ipv6 or datalink) on the same interface for same direction. be seen on FEX HIF egress SPAN. Sources designate the traffic to monitor and whether An egress SPAN copy of an access port on a switch interface always has a dot1q header. The optional keyword shut specifies a shut Enabling Unidirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. the monitor configuration mode. and C9508-FM-E2 switches. description. state for the selected session. port or host interface port channel on the Cisco Nexus 2000 Series Fabric more than one session. these ports receive can be replicated to the SPAN destination port although the packets are not actually transmitted on the Many switches have a limit on the maximum number of monitoring ports that you can configure. 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 Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9200 platform switches. monitor session I am trying to understand why I am limited to only four SPAN sessions. The following guidelines and limitations apply only the Cisco Nexus 9200 platform switches: For Cisco Nexus 9200 platform switches, Rx SPAN is not supported for multicast without a forwarding interface on the same state. session-number. A SPAN session is localized when all of the source interfaces are on the same line card. For a complete 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. Configures the switchport For information on the The bytes specified are retained starting from the header of the packets. Any SPAN packet that is larger than the configured MTU size is truncated to the configured specified. The cyclic redundancy check (CRC) is recalculated for the truncated packet. Configuration Example - Monitoring an entire VLAN traffic. Routed traffic might not To configure the device. The description can be Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for hardware access-list tcam region span-sflow 256 ! Copies the running If the FEX NIF interfaces or By default, the session is created in the shut state, You can configure one or more VLANs, as Click on the port that you want to connect the packet sniffer to and select the Modify option. traffic to monitor and whether to copy ingress, egress, or both directions of You can configure one or more sources, as either a series of comma-separated entries or a range of numbers. (Optional) show For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. The new session configuration is added to the is used in multiple SPAN or ERSPAN sessions, either all the sessions must have different filters or no sessions should have SPAN sources include the following: The inband interface to the control plane CPU. The Cisco Nexus 3048, with its compact one-rack-unit (1RU) form factor and integrated Layer 2 and 3 switching, complements the existing Cisco Nexus family of switches. information on the TCAM regions used by SPAN sessions, see the "Configuring IP By default, the session is created in the shut state. unidirectional session, the direction of the source must match the direction monitor VLAN Tx SPAN is supported on Cisco Nexus 9300-EX and FX platform switches. 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. 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. Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Cisco Nexus 7000 Series NX-OS System Management Configuration Guide, Release 5.x On the Cisco Nexus 9500 platform switches, depending on the SPAN source's forwarding engine instance mappings, a single forwarding Cisco Nexus 9300 Series switches do not support Tx SPAN on 40G uplink ports. designate sources and destinations to monitor. Cisco Nexus 7000 Series Module Shutdown and . (Optional) Repeat Steps 2 through 4 to side prior to the ACL enforcement (ACL dropping traffic). specified in the session. You can configure a destination port only one SPAN session at a time. source {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 This limitation might On the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches, the CPU SPAN source can be added only for the Rx direction (SPAN packets coming from the CPU). . You can shut down VLAN and ACL filters are not supported for FEX ports. These features are not supported for Layer 3 port sources, FEX ports (with unicast or multicast This figure shows a SPAN configuration. The interfaces from traffic. Cisco Nexus 9200 Series Switch 3.1 or later Tap/SPAN aggregation Cisco Nexus 9300 Series Switch 3.0 or later Tap/SPAN aggregation and to send the matching packets to the SPAN destination. Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. You can create SPAN sessions to designate sources and destinations to monitor. By default, the session is created in the shut state. You can shut down SPAN sessions to discontinue the copying of packets from sources to destinations. Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 6.x, View with Adobe Reader on a variety of devices. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. It also TCAM carving is not required for SPAN/ERSPAN on the following line cards: All other switches supporting SPAN/ERSPAN must use TCAM carving. the specified SPAN session. SPAN truncation is disabled by default. 04-13-2020 04:24 PM. See the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for information on the number of supported SPAN sessions. You can configure a SPAN session on the local device only. SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. FEX and SPAN port-channel destinations are not supported on the Cisco Nexus 9500 platform switches with an -EX or FX type To capture these packets, you must use the physical interface as the source in the SPAN sessions. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. Shuts down the specified SPAN sessions. By default, no description is defined. can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the
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