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Showing posts from January, 2026
Routing-policies
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| Policy Tool | Used For | | ---------------- | ------------------------ | | Prefix-list | Fast prefix filtering | | Route-map | Conditional policy logic | | ACL | Legacy filtering | | BGP Community | Route tagging | | AS-Path filter | Loop & transit control | | Route tag | Redistribution safety | | PBR | Traffic steering | | Distribute-list | Basic filtering | | Policy-statement | Modern policy framework | | RPKI | Route security | ...
EVPN-FABRIC-Highlevel
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RD- VTEP-IP:EVI instance ID RT- ASNNUMVER: VNI-ID Ex: for vlan based EVPN model VRF VLAN VNI RD RT VRF-1 10 10100 10.1.1.11:10100 65001:10100 VRF-1 20 10200 10.1.1.11:10200 65001:10200 VRF-1 30 10300 10.1.1.11:10300 65001:10300 VRF-2 40 10400 10.1.1.11:10400 65001:10400 VRF-2 50 10500 10.1.1.11:10500 65001:10500 VRF-2 60 10600 10.1.1.11:10600 65001:10600
EVPN-Multi-homing-BUM-traffic-Handling
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Case-1: Traffic Egress from dual homed end-host 1.It may land on DF or non-DF based on hashing algorithm 2. For traffic from end-host to EVPN core DF,non-DF will not play any role 3. in case BUM lands on Leaf-1 it should flood to all the VTEPs participating on that vlan(vlan-10 in this case) 4.It may use head-end replication or underlay multicast (PIM) 5.all other VTEPS receive the BUM traffic (including Leaf-2 in this case) 6.reason for Leaf-2 to receive this - there should be other hosts on the same vlan (host-2) 7.now leaf-2 apply split-horizon rule. check the source VTEP ip and get to know its part of same ESI. and it wont forward to ESI-10 interface 8.But it can still forward to Host-2 Case-2: Traffic Ingress for dual-home server 1.Host-3 sends BUM traffic 2.Either head-end replication or underlay multicast 3.only DF will forward to the ESI segment
All_About_Netconf
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Transport-level keepalive NETCONF over SSH (most common) Uses SSH keepalive NETCONF over TLS Uses TLS keepalive / TCP keepalive NETCONF over TCP Relies on TCP keepalive Application-level “soft keepalive” (common practice)**Although not mandated, many clients periodically send lightweight RPCs : Hello-Message Exchange 'Capabilities' base:1.0 base:1.1 candidate -Enables candidate → commit workflow, Safer than editing running directly writable-running -Allows editing running directly confirmed-commit - Auto-rollback if device becomes unreachable rollback-on-error - Roll back changes if any error occurs in <edit-config> lock -Prevents concurrent config edits xpath - Filtering & Query Critical for large YANG models notification - Enables event subscriptions validate - Validate config before commit 1️.Standard NETCONF Datastores (RFC 6241) These are the core datastores defined by NETCONF. 🔹 running Active configura...
K8S_POD-to-POD
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root@ems203-m1:/home/labadmin# kubectl get pods -A -o wide | grep ems203-w2 ems edgecloud-suse-adapter-df5d6d78b-m5zc2 1/1 Running 0 13m 10.233.101.222 ems203-w2 <none> <none> ems ems-a10nsp-accounting-89c69b796-rpb9k 1/1 Running 0 4m28s 10.233.101.224 ems203-w2 <none> <none> root@ems203-w2:/home/labadmin# ip r default via 172.27.7...