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SDA 環境における C9300 が ARP パケットを受信した際に再起動する場合がある

  2026年1月26日 (初版)   TAC SR Collection主な問題 SDA 環境の C9300 シリーズスイッチにおいて、Catalyst Center から新しい VRF やサブネットの設定が投入された直後に、当該インターフェースで ARP パケットを受信すると、ARP Snoop プロセスで問題が発生しスイッチが予期せず crash し再起動する場合があります。本事象発生時には、生成された crashinfo ファイルに以下のログが記録されます。 UNIX-EXT-SI...

Catalyst 9000 シリーズにおいて NAT Overload 設定時に Telnet/SSH 接続が失敗する

  2026年1月26日 (初版)   TAC SR Collection主な問題 Catalyst 9000 シリーズ スイッチにおいて、Interface Overload を設定している環境下で、Telnet や SSH セッションの確立に失敗する場合があります。発生条件として、以下の設定例のように ip nat inside source list ... pool ... overload コマンドを使用している場合に本事象が発生します。 ip nat pool <pool-na...

[HCI with Nutanix] C220/C240 M6/M7 mLOM 交換手順 (ISM)

作業前確認作業手順作業手順 - mLOM 交換作業後手順参考資料   本ドキュメントでは、 HCI with Nutanix C220/C240 M6/M7 (ISM 構成)の mLOM 交換手順について説明します。   作業前確認 - FE作業 1. CIMC の [Chassis] タブで [Faults and Logs] メニューを選択し、右画面の [障害の概要] を確認して、発生している Fault を確認します。こちらの Fault については後ほど確認するため、念のためメモしておい...

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daiogawa by • Cisco Employee
  • 35 Views
  • 0 replies
  • 0 Helpful votes

Resolved! show arp vs show mac-address-table

show arp vs show mac-address-table I am using GNS3. For switch, I am attaching switch 16 module for simulation. For my router and switch (router with switch module on it) both works commands "show arp" and "show mac-address-table". From router, "sho...

How to configure STP for an RSPAN aggregator switch to analyzer?

Hi,I'm using an old Cisco 3750x as an aggregator switch for a number of other switches which are configured with an RSPAN vlan.  The Cisco 3750x then has the uplink port connected to a passive network monitoring sensor which ingests all the SPAN traf...

gopher99 by • Level 1
  • 514 Views
  • 8 replies
  • 0 Helpful votes

Advertise default route into VXLAN EVPN

Hello,I am doing a little lab with VLXAN EVPN. I have configured the SPINE switches as border nodes, and peered them over iBGP with a WAN Edge router that is on SD-WAN. With the SD-WAN VPNs the setup and BGP peering was very straight forward. My SPIN...

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JUANNN by • Spotlight
  • 215 Views
  • 5 replies
  • 0 Helpful votes

Lan automation

"Hi all, I'm working on a Cisco SD-Access sandbox lab and encountering an issue with LAN Automation. When I initiate the discovery process, I receive the error: 'NCSU60006: Invalid CLI user defined for discovered site'.  I've already verified that my...

Help with on-prem SD-WAN controllers

1. Environment and ArchitectureAll the controllers are on-premises (vManage, vSmart, vBond) and sit on the same local subnet behind a UniFi Firewall/NAT.We have 5 Static Public IPs. I have configured 1:1 NAT (Port Forwarding) mapping a unique Public ...

TEAP Failed User

Hi, Our customer is using 2xCisco ISE 3.4 P3 integrated with AD. They have two domains xyz.com and aaa.com. Cisco ISE is configured at the domain xyz.com We are using TEAP for dot1x and the computer authentication is working. Only the user authentica...

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