Cisco NX-OS: VXLAN and External Connectivity
By default: underlay – default VRF overlay – “tenant” VRF, hosts in VXLAN are isolated Border Leafs are used to connect the internal fabric to external networks. Not necessary a...
December 5, 2019
Tagged: NX-OS
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...
December 3, 2019
Cisco NX-OS: VXLAN Symmetric Routing
EVPN Integrated Routing and Bridging (IRB) has two options: Asymmetric IRB (increased ARP cache and CAM table sizes and control plane scaling issue) Symmetric IRB Symmetric IRB Ingress VTEP does...
November 26, 2019
Cisco NX-OS: VXLAN Asymmetric Routing
EVPN Integrated Routing and Bridging (IRB) has two options: Asymmetric IRB Symmetric IRB Assymetric IRB Ingress VTEP does both L2 and L3 lookup Egress VTEP does L2 lookup only =>...
November 21, 2019
Cisco NX-OS: VXLAN BGP EVPN control plane
Two control planes for the VXLAN technology: Multicast control plane (flood-and learn) MP-BGP EVPN control plane MP-BGP EVPN is a standard-based VXLAN control protocol, that provides remote VTEP discovery and...
November 19, 2019
Cisco NX-OS: VXLAN Multicast Control Plane
Two control planes for the VXLAN technology: Multicast control plane (flood and learn) MP-BGP EVPN control plane Virtual Extensible Local Area Networks (VXLANs) allows to extend reachability of a VLAN...
November 14, 2019
Cisco NS-OS: Virtual eXtensible LAN (VXLAN) Overview
VXLAN is a tunneling protocol that encapsulates Layer 2 Ethernet frames in Layer 3 UDP packets. Why VXLAN: VLAN Scalability – expands VLAN name space VLANs use 12 bit -4096 values...
November 12, 2019
Cisco NX-OS: FabricPath (FP)
FabricPath (FP) is a L2 Routing = “MAC-in-MAC” Routing. FabricPath is Cisco proprietary and works in the same way as TRILL (Transparent Interconnection of Lots of Links) that is an...
October 30, 2019
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...
October 28, 2019
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 –...
October 23, 2019