Tagged: vPC

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Cisco NX-OS: VXLAN – vPC – Anycast

VxLAN and vPC Anycast VTEP Problem with VXLAN and vPC: in a vPC both vPC peers duplicate EVPN MAC/IP routes to spine RRs with other attributes equal, one vPC peer is always preferred for dual attached hosts (based on the normal BGP Best path selection) Result: egress traffic from vPC Member is load-balanced, but return ingress traffic is polarized Solution: Anycast VTEP...

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Cisco NX-OS: vPC & Failures

vPC Orphan Ports – Traffic from remote Orphan is allowed over Peer Link and exit via local Member– Traffic from remote Member is allowed over Peer Link and exit via local Orphan-Orphans ports should be avoided at all costs because PL is a bottleneck of the system Ideal: vPC Peers only have vPC Member Ports and all downstream devices are dual...

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Cisco NX-OS: vPC & FHRP

FHRP acts as active/active forwarding over vPC: traffic received in vPC Member Port of FHRP Standby to FHRP Virtual MAC is not forwarded over Peer Link to Active FHRP – essentially HSRP Standby acts as HSRP Active peer-gateway allows to proxy not only virtual active MAC address but also to proxy physical primary MAC address (in case destination MAC address is...

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Cisco NX-OS: From vPC to Back-to-Back vPC

The vPC Peer Link should never be blocking because this link carries important traffic such as the Cisco Fabric Services over Ethernet (CFSoE) Protocol. The peer link is always forwarding. STP from SW8 and SW9: STP from NXOS1 and NXOS2: In the correct design, the vPC Peer Link should be used only in case of failure. All links are up and...

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Cisco NX-OS: vPC Configuration

vPC Order of Operations IP connectivity for Peer Keepalive Enable vPC & LACP globally Create vPC domain define Peer Keepalive address configure vPC role priority (Optional) – lower priority => vPC primary switch. (default 32667) Establish Port Channel for vPC Peer link Verify vPC Consistency Parameters Disable vPC Member Port (optional but recommended) Configure vPC Member Ports Enable vPC Member Ports...

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Cisco NX-OS: Virtual Port Channel (vPC)

Three Main Types of MCEC (Multi Chassis EtherChannel) C3750 Cross Stack Port Channels (StackWise) single control plane C6500 Virtual Switching System (VSS) single control plane via Virtual Switch Link (VSL) Nexus Virtaul Port Channel (vPC) separate control planes separate control plane protocol instances (STP/IGPs/BGP/FHRP) via a Peer Link (like VSS’s VSL) Each vPC peer has Peer Link to sync control plane...