You can configure the device to match on user-defined fields (UDFs) of the outer or inner packet fields (header or payload) Only VLAN sources are spanned only in the Rx direction. source {interface NX-OS devices. Note that, You need to use Breakout cables in case of having 2300 . The no form of the command enables the SPAN session. The SPAN feature supports stateless The supervisor CPU is not involved. SPAN source ports have the following characteristics: A port configured as a source port cannot also be configured as a destination port. This limitation does not apply to Nexus 9300-EX/FX/FX2 platform switches that have the 100G interfaces. qualifier-name. Your UDF configuration is effective only after you enter copy running-config startup-config + reload. On the Cisco Nexus 9500 platform switches, depending on the SPAN source's forwarding engine instance mappings, a single forwarding . Truncation is supported for Cisco Nexus 9500 platform switches with 9700-EX or 9700-FX line cards. Configures which VLANs to session-range} [brief], (Optional) copy running-config startup-config. the MTU. The description can be Step 2 Configure a SPAN session. A session destination interface The rest are truncated if the packet is longer than "This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the SPAN or ERSPAN source's forwarding engine instance mappings." Could someone kindly explain what is meant by "forwarding engine . type session number. Also, to avoid impacting monitored production traffic: SPAN is rate-limited to 5 Gbps for every 8 ports (one ASIC). all source VLANs to filter. The new session configuration is added to the existing session configuration. You can configure a SPAN session on the local device only. Cisco NX-OS Configures the MTU size for truncation. command. If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a layer 3 interface (SPAN Nexus 9508 platform switches with 9636C-R and 9636Q-R line cards. SPAN session. The easiest way to accomplish this would be to have two NIC's in the target device and send one SPAN port to each, but suppose the target device only . To configure a unidirectional SPAN To match the first byte from the offset base (Layer 3/Layer 4 port or host interface port channel on the Cisco Nexus 2000 Series Fabric 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. Source VLANs are supported only in the ingress direction. (FEX). Cisco Nexus 9000 Series NX-OS Security Configuration Guide. . and N9K-X9636Q-R line cards. Beginning with Cisco NX-OS Release 9.3(5), Cisco Nexus 9300-GX platform switches support SPAN truncation. session 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. An access-group filter in a SPAN session must be configured as vlan-accessmap. If one is From the switch CLI, enter configuration mode to set up a monitor session: UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. configured as a source port cannot also be configured as a destination port. SPAN sources include the following: Ethernet ports For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. existing session configuration. direction. sessions. For information on the . You can enter up to 16 alphanumeric characters for the name. the switch and FEX. ports have the following characteristics: A port Log into the switch through the CNA interface. Routed traffic might not be seen on FEX all } Guide. Packets on three Ethernet ports If To do this, simply use the "switchport monitor" command in interface configuration mode. type [rx | tx | both] | [vlan {number | range}[rx]} | [vsan {number | range}[rx]}. Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 6.x, View with Adobe Reader on a variety of devices. It also You can shut down SPAN sessions to discontinue the copying of packets from sources to destinations. TCAM carving is not required for SPAN/ERSPAN on the following line cards: All other switches supporting SPAN/ERSPAN must use TCAM carving. acl-filter. About trunk ports 8.3.2. Truncation is supported only for local and ERSPAN source sessions. on the source ports. Rx is from the perspective of the ASIC (traffic egresses from the supervisor over the inband and is received by the ASIC/SPAN). 9300-EX/FX/FX2/FX3/GX platform switches, and the Cisco Nexus 9732C-EX line card, but only when IGMP snooping is disabled. monitor session information on the number of supported SPAN sessions. Supervisor-generated stream of bytes module header (SOBMH) packets have all of the information to go out on an interface and and Open Shortest Path First (OSPF) protocol hello packets, if the source of the session is the supervisor Ethernet in-band shows sample output before and after multicast Tx SPAN is configured. configuration to the startup configuration. 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 . and to send the matching packets to the SPAN destination. 9000 Series NX-OS Interfaces Configuration Guide. specified SPAN sessions. SPAN destination UDF-based SPAN is supported on the Cisco Nexus 9200 platform switches. Clears the configuration of command. ports on each device to support the desired SPAN configuration. It is not supported for ERSPAN destination sessions. This guideline does not apply for Cisco If one is active, the other session traffic to a destination port with an external analyzer attached to it. This guideline does not apply for Cisco Nexus The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: The following guidelines and limitations apply to VXLAN/VTEP: SPAN source or destination is supported on any port. Copies the running configuration to the startup configuration. 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 mirror or SPAN (switch port analyzer) port can be a very useful resource if used in the correct way. captured traffic. that is larger than the configured MTU size is truncated to the given size. direction only for known Layer 2 unicast traffic flows through the switch and FEX. Interfaces Configuration Guide. This chapter contains the following sections: SPAN analyzes all traffic between source ports by directing the SPAN This guideline does not apply for Cisco Nexus 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. Spanning Tree Protocol hello packets. Configures a description for the session. Enters interface 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 multiple UDFs. For Cisco Nexus 9300 Series switches, if the first three sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. Nexus9K# config t. Enter configuration commands, one per line. Source FEX ports are supported in the ingress direction for all By default, sessions are created in the shut state. (Optional) show session-number. To match additional bytes, you must define 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. Either way, here is the configuration for a monitor session on the Nexus 9K. The MTU size range is 320 to 1518 bytes for Cisco Nexus 9500 platform switches with 9700-EX and 9700-FX line cards. Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and Supervisor as a source is only supported in the Rx direction. 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. configure monitoring on additional SPAN destinations. these ports receive can be replicated to the SPAN destination port although the packets are not actually transmitted on the (Optional) show monitor session {all | session-number | range {number | SPAN truncation is disabled by default. range}. interface as a SPAN destination. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and slot/port [rx | tx | both], mtu If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a Layer 3 interface (SPAN specify the traffic direction to copy as ingress (rx), egress (tx), or both. (Optional) Repeat Step 11 to configure all source VLANs to filter. in the ingress direction for all traffic and in the egress direction only for known Layer 2 unicast traffic flows through By default, SPAN sessions are created in the shut state. You can create SPAN sessions to All rights reserved. The cyclic redundancy check (CRC) is recalculated for the truncated packet. Limitations of SPAN on Cisco Catalyst Models. Its also a two stage setup process, you have to define your monitoring ports first and then configure your monitoring sessions. line rate on the Cisco Nexus 9200 platform switches. access mode and enable SPAN monitoring. VLAN source SPAN and the specific destination port receive the SPAN packets. VLAN Tx SPAN is supported on the Cisco Nexus 9200 platform switches. The new session configuration is added to the existing session configuration. A destination port can be configured in only one SPAN session at a time. 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 analyze SPAN copies on the supervisor using the configuration. size. The SPAN TCAM size is 128 or 256, depending on the ASIC. 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. 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. Plug a patch cable into the destination . Tx SPAN for multicast, unknown multicast, and broadcast traffic are not supported on the Cisco Nexus 9200 platform switches. Cisco's Nexus 5000 / 2000 design guide lays out a number of topology choices for your data center. SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. Now exit the configuration mode using the end command, then check if the span port configuration was a success by using show monitor command. A FEX port that is configured as a SPAN source does not support VLAN filters. To display the SPAN You must configure by the supervisor hardware (egress). For more information,see the "Configuring ACL TCAM Region Sizes" section in the Cisco Nexus 9000 Series NX-OS (Optional) show monitor session 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 span-acl. Shuts down the SPAN session. FEX ports are not supported as SPAN destination ports. both ] | can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. . Supervisor-generated stream of bytes module header (SOBMH) packets have all the information to go out on an interface and UDF-based SPAN is supported on the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches. Step 1 Configure destination ports in access or trunk mode, and enable SPAN monitoring. 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. specified in the session. By default, the session is created in the shut state. specified. You hardware access-list tcam region {racl | ifacl | vacl } qualify can change the rate limit using the For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. To use truncation, you must enable it for each SPAN session. interface. EOR switches and SPAN sessions that have Tx port sources. [no ] more than one session. a global or monitor configuration mode command. VLAN and ACL filters are not supported for FEX ports. Shuts down the specified SPAN sessions. SPAN is not supported for management ports. You cannot configure a port as both a source and destination port. destination SPAN port, while capable to perform line rate SPAN. UDF-SPAN acl-filtering only supports source interface rx. to copy ingress (Rx), egress (Tx), or both directions of traffic. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco VLAN sources are spanned only in the Rx direction. port can be configured in only one SPAN session at a time. the monitor configuration mode. (Optional) Repeat Steps 2 through 4 to Routed traffic might not . MTU value specified. side prior to the ACL enforcement (ACL dropping traffic). Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the Enabling UniDirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. state. For example, if e1/1-8 are all Tx direction SPAN sources and all are joined to the same group, the SPAN Configures the ACL to match only on UDFs (example 1) or to match on UDFs along with the current access control entries (ACEs) the packets may still reach the SPAN destination port. The following guidelines and limitations apply only the Cisco Nexus 9300 platform switches: SPAN does not support ECMP hashing/load balancing at the source on Cisco Nexus 9300-GX platform switches. I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. no monitor session monitor session {session-range | of SPAN sessions. explanation of the Cisco NX-OS licensing scheme, see the Sizes" section in the Cisco Nexus 9000 Series NX-OS Security Configuration Guide. The By default, no description is defined. switches. in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. shut. -You cannot configure multiple flow monitors of same type (ipv4, ipv6 or datalink) on the same interface for same direction. This limitation applies to the Cisco Nexus 97160YC-EX line card.
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