cisco:switch:9500:cisco_catalyst_9500_series_manual
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| cisco:switch:9500:cisco_catalyst_9500_series_manual [2025/07/30 21:12] – [VXLAN – Core Terminology and Nomenclature] aperez | cisco:switch:9500:cisco_catalyst_9500_series_manual [2026/06/11 17:26] (current) – aperez | ||
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| + | |||
| + | Switch#do show interfaces status | ||
| Switch#show running-config interface Port-channel2 | Switch#show running-config interface Port-channel2 | ||
| Switch#show interfaces status | Switch#show interfaces status | ||
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| - | ==== ✅ Tip for Studying | + | ==== ✅ VXLAN overlays |
| - | VXLAN overlays | + | allow to: |
| * Stretch VLANs across L3 boundaries | * Stretch VLANs across L3 boundaries | ||
| * Enable mobility and segmentation | * Enable mobility and segmentation | ||
| * Scale beyond 4094 VLAN limit using 16 million VNIs | * Scale beyond 4094 VLAN limit using 16 million VNIs | ||
| - | Study both the **terminology** and the **CLI structure** in IOS-XE and NX-OS for a full understanding. | + | ---- |
| + | ---- | ||
| + | |||
| + | ====== VXLAN Static Configuration – Cisco 9500 ⇄ Aruba 6300 ====== | ||
| + | |||
| + | === 📘 Architecture Summary === | ||
| + | |||
| + | ^ Parameter | ||
| + | | VTEP Loopback IP | 172.22.32.1 | ||
| + | | Transport IP | 172.18.32.33 (To Aruba) | ||
| + | | Transport Interface | ||
| + | | OSPF Area | 0 | 0 | | ||
| + | | VXLAN Mode | Static VXLAN | Static VXLAN | | ||
| + | | VXLAN Interface | ||
| + | | VNIs | 10001, 10700–10732 | ||
| + | | Inter-VXLAN Bridging | ||
| + | |||
| + | ---- | ||
| + | |||
| + | === 🚀 Cisco 9500 Configuration === | ||
| + | |||
| + | ==== 🔹 1. VTEP Loopback ==== | ||
| + | interface Loopback0 | ||
| + | ip address 172.22.32.1 255.255.255.255 | ||
| + | |||
| + | ==== 🔹 2. Transport Interface ==== | ||
| + | interface TenGigabitEthernet1/ | ||
| + | | ||
| + | ip address 172.18.32.33 255.255.255.252 | ||
| + | no shutdown | ||
| + | |||
| + | ==== 🔹 3. OSPF ==== | ||
| + | router ospf 100 | ||
| + | | ||
| + | | ||
| + | | ||
| + | |||
| + | ==== 🔹 4. Static Route ==== | ||
| + | ip route 172.22.32.2 255.255.255.255 172.18.32.34 | ||
| + | |||
| + | ==== 🔹 5. NVE Interface ==== | ||
| + | interface nve1 | ||
| + | no shutdown | ||
| + | | ||
| + | | ||
| + | | ||
| + | | ||
| + | | ||
| + | | ||
| + | |||
| + | ==== 🔹 6. Bridge Domains ==== | ||
| + | bridge-domain 1 | ||
| + | | ||
| + | |||
| + | bridge-domain 700 | ||
| + | | ||
| + | |||
| + | bridge-domain 712 | ||
| + | | ||
| + | |||
| + | bridge-domain 730 | ||
| + | | ||
| + | |||
| + | bridge-domain 732 | ||
| + | | ||
| + | |||
| + | ---- | ||
| + | |||
| + | === 🧩 Aruba 6300 Configuration === | ||
| + | |||
| + | ==== 🔹 1. Loopback Interface ==== | ||
| + | interface loopback 0 | ||
| + | ip address 172.22.32.2/ | ||
| + | |||
| + | ==== 🔹 2. Transport Interface ==== | ||
| + | interface 1/1/12 | ||
| + | | ||
| + | ip address 172.18.32.34/ | ||
| + | no shutdown | ||
| + | |||
| + | ==== 🔹 3. OSPF ==== | ||
| + | router ospf | ||
| + | | ||
| + | area 0.0.0.0 | ||
| + | | ||
| + | | ||
| + | |||
| + | ==== 🔹 4. Static Route ==== | ||
| + | ip route 172.22.32.1/ | ||
| + | |||
| + | ==== 🔹 5. VXLAN Interface ==== | ||
| + | interface vxlan 1 | ||
| + | | ||
| + | | ||
| + | |||
| + | ==== 🔹 6. VNI to VLAN Mapping ==== | ||
| + | vxlan vlan 1 vni 10001 | ||
| + | vxlan vtep 172.22.32.1 | ||
| + | |||
| + | vxlan vlan 700 vni 10700 | ||
| + | vxlan vtep 172.22.32.1 | ||
| + | |||
| + | vxlan vlan 712 vni 10712 | ||
| + | vxlan vtep 172.22.32.1 | ||
| + | |||
| + | vxlan vlan 730 vni 10730 | ||
| + | vxlan vtep 172.22.32.1 | ||
| + | |||
| + | vxlan vlan 732 vni 10732 | ||
| + | vxlan vtep 172.22.32.1 | ||
| + | |||
| + | ---- | ||
| + | |||
| + | === 🧪 Validation Commands === | ||
| + | |||
| + | ==== 🔸 Cisco 9500 ==== | ||
| + | show nve interface nve1 | ||
| + | show nve vni summary | ||
| + | show nve vni interface nve 1 | ||
| + | show nve peers | ||
| + | ping 172.22.32.2 source 172.22.32.1 | ||
| + | show mac address-table vlan 712 | ||
| + | |||
| + | ==== 🔸 Aruba 6300 ==== | ||
| + | show interface vxlan 1 | ||
| + | show interface vxlan vni vteps | ||
| + | ping 172.22.32.1 source 172.22.32.2 | ||
| + | show mac-address-table vlan 712 | ||
| + | |||
| + | |||
| + | |||
| + | === ✅ Notes === | ||
| + | |||
| + | | ||
| + | | ||
| + | * For production EVPN deployment, BGP configuration will be required. | ||
| + | |||
| + | |||
| + | |||
| + | ---- | ||
| + | ---- | ||
| + | |||
| + | {{ : | ||
| + | |||
| + | {{pdfjs 46em >: | ||
| + | |||
| + | ---- | ||
| + | ---- | ||
| + | |||
| + | |||
| + | {{ : | ||
| + | |||
| + | {{pdfjs 46em >: | ||
| + | |||
| + | |||
| + | |||
| + | ---- | ||
| + | ---- | ||
| + | |||
| + | ====== Cisco C9500 SUR — Timeout de SSH desde sitio remoto (MTU residual de VXLAN) ====== | ||
| + | |||
| + | **Fecha:** 2026-06-11 | ||
| + | **Equipo:** C9500SP1 (LAG-17-C9500SP2) — 172.20.28.37 (SUR, sitio local) | ||
| + | **Estado:** Resuelto | ||
| + | |||
| + | ===== Síntoma ===== | ||
| + | El SSH al switch funcionaba desde la LAN local del mismo sitio, pero daba timeout desde el sitio remoto de gestión (10.57.0.x). El ping ICMP y el SNMPv3 (snmpget) desde el sitio remoto funcionaban bien; solo fallaba el SSH (y el playbook de baseline de ASH, que usa SSH) con " | ||
| + | |||
| + | ===== Causa raíz ===== | ||
| + | Problema de MTU en el path, secuela del VXLAN removido: | ||
| + | * El path WAN/VPN entre el sitio local y el sitio remoto tiene MTU menor a 1500 (ping con DF: 1400 pasa, 1500 falla con " | ||
| + | * La SVI de gestión **Vlan1** había quedado con **MTU 9100 (jumbo)**, heredado de la configuración VXLAN. | ||
| + | * Con ese MTU local jumbo, el switch enviaba segmentos TCP grandes hacia el sitio remoto (respetando el MSS anunciado por el cliente, 1460), y esos paquetes de ~1500 morían en el enlace de ~1400. ICMP/SNMP (paquetes chicos) pasaban; por eso solo se rompía el SSH/TCP. | ||
| + | * También explica por qué solo este switch fallaba y no los demás del SUR: los otros tienen MTU normal en su interfaz de gestión. | ||
| + | |||
| + | Un '' | ||
| + | |||
| + | ===== Solución ===== | ||
| + | Bajar el MTU de IP de la SVI de gestión para que quepa en el path. Es seguro: solo afecta el MTU de IP de Vlan1 (gestión), no el MTU L2, ni las interfaces físicas/ | ||
| + | |||
| + | < | ||
| + | configure terminal | ||
| + | interface Vlan1 | ||
| + | ip mtu 1400 | ||
| + | end | ||
| + | write memory | ||
| + | </ | ||
| + | |||
| + | Limpieza opcional (el mss clamp global no era necesario y deja un warning de throughput): | ||
| + | < | ||
| + | configure terminal | ||
| + | no ip tcp mss 1360 | ||
| + | end | ||
| + | write memory | ||
| + | </ | ||
| + | |||
| + | ===== Validación ===== | ||
| + | Desde el sitio remoto de gestión: | ||
| + | <code bash> | ||
| + | ssh admin@172.20.28.37 | ||
| + | </ | ||
| + | El SSH ahora conecta normal. El SNMPv3 ya estaba en su lugar: | ||
| + | <code bash> | ||
| + | snmpget -v3 -l authPriv -u ash-monitor -a SHA -A '< | ||
| + | # -> STRING: " | ||
| + | </ | ||
| + | |||
| + | ===== Comandos de diagnóstico (referencia) ===== | ||
| + | < | ||
| + | ! Confirmar el MTU del path (desde el switch) | ||
| + | ping 10.57.0.241 source Vlan1 size 1400 df-bit repeat 5 ! pasa | ||
| + | ping 10.57.0.241 source Vlan1 size 1500 df-bit repeat 5 ! falla (MMMMM) | ||
| + | |||
| + | ! Confirmar el MTU jumbo en la SVI de gestión | ||
| + | show interface Vlan1 | include MTU ! mostró MTU 9100 | ||
| + | </ | ||
| + | |||
| + | ===== Notas ===== | ||
| + | * Tras cualquier remoción futura de VXLAN en un switch, revisar el MTU de la SVI de gestión: el residuo jumbo causa exactamente este síntoma. | ||
| + | * El playbook baseline de ASH usa SSH, así que esto también desbloquea LAG-17 en baseline_south.yml en la próxima corrida. | ||
| ---- | ---- | ||
| ---- | ---- | ||
cisco/switch/9500/cisco_catalyst_9500_series_manual.1753909945.txt.gz · Last modified: by aperez
