My CUCM SRND Design Notes 10.X – SIP TRUNK Deployments

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Best Effort Early Offer [Early Offer support for voice and video calls Best Effort (no MTP inserted)] Best Effort Early Offer can be enabled on the SIP Profile associated with the SIP trunk, and it is the recommended configuration for all Unified CM and Unified CM Session Management Edition (SME) trunks. Best Effort Early Offer trunks never use MTPs to create an Early Offer and, depending on the calling device, may initiate an outbound SIP…

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Unique RD per PE in MPLS VPN for Load Sharing and Faster Convergence

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Hi Guys , I found the below link useful for Designing MPLS load sharing and Fast Convergence. Original Link# http://lostintransit.se/2015/01/11/unique-rd-per-pe-in-mpls-vpn-for-load-sharing-and-faster-convergence/   This post describes how load sharing and faster convergence in MPLS VPNs is possible by using an unique RD per VRF per PE. It assumes you are already familiar with MPLS but here is a quick recap. The Route Distinguisher (RD) is used in MPLS VPNs to create unique routes. With IPv4, an IP…

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Cisco IOS- IP Helper Address Command

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Original Link# http://www.ciscopress.com/articles/article.asp?p=330807&seqNum=9 Helper Addresses This section describes how networks and routers use helper addresses to forward broadcasts to another server or router on another network. This section describes some of the purposes of and scenarios in which to use helper addresses. Using Helper Addresses DHCP is not the only critical service that uses broadcasts. Cisco routers and other devices might use broadcasts to locate TFTP servers. Some clients might need to broadcast to locate…

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Unified CM High Availability / Call Processing Redundancy / Upgrading CUCM Cluster

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Unified CM High Availability Because of the underlying Unified CM clustering mechanism, a Unified Communications System has additional high availability considerations above and beyond hardware platform disk and power component redundancy, physical network location, and connectivity redundancy. This section examines call processing subscriber redundancy considerations, call processing load balancing, and redundancy of additional cluster services. Call Processing Redundancy Unified CM provides the following call processing redundancy configuration options or schemes: Two to one (2:1) — For every two…

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Cisco CUCM : Troubleshoot Backup Issue

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Hi Guys , I found below link useful when troubleshooting CUPS backup issues, Original Link # https://bsoftbangalore.wordpress.com/2012/06/14/cisco-cucm-7-x8-x-troubleshoot-backup-issue/ Cisco Unified Communications Manager backups are not running as scheduled. All Disaster Recovery Framework (DRF) services are down, and no new devices, schedules, or statuses can be viewed from the DRF console. Also, when you access the DRF admin pages, this error message is received: Status: Local Agent is not responding. This may be due to Master or…

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BUG CSCsr87199 ; DRS backup never releases lock – stops performing backups

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DRS backup never releases lock – stops performing backups CSCsr87199 Description Symptom:– DRS Backups stop executing automatically. – When you attempt a manual backup, you get an error saying: “Backup operation currently in progress…. please wait and try after sometime” – When trying to install a new version or a COP file, you get the following error: “The system is currently locked by another process. Please try again later” Conditions: Occurs if DRF is scheduled…

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UCS: Invalid Keyring certificate alert on UCSM

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Problem Description: Invalid Keyring certificate alert on UCSM Action Plan: Went on call and saw the keyring had expired: EXB-B /security/keyring # show det Keyring default:     RSA key modulus: Mod2048     Trustpoint CA:     Cert Status: Expired – Closed the UCSM GUI, and regenerated the keyring. # scope security /security # scope keyring default /security/keyring # set regenerate yes /security/keyring *# commit-buffer EXB-B /security/keyring # show det Keyring default:     RSA key modulus: Mod2048…

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N9K Remote Python

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original Link # https://github.com/datacenter/nexus9000 # Copyright (C) 2013 Cisco Systems Inc. # All rights reserved import sys sys.path.append(“./cisco”) sys.path.append(“./utils”) from nxapi_utils import NXAPITransport from cisco.interface import Interface ################### # NXAPI init block ################### target_url = “http://10.30.14.8/ins” username = “admin” password = “admin” NXAPITransport.init(target_url=target_url, username=username, password=password) ################### ################### # cli/clip/clid are changed a bit, but largely the same ################### print NXAPITransport.cli(“show version“) NXAPITransport.clip(“show interface brief“) NXAPITransport.clic(“conf t ;interface eth4/1 ;no shut“) print NXAPITransport.clid(“show version“) ################### #…

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Troubleshooting CUCM Database Replication in Linux Appliance Model

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  CUCM Database Replication is an area in which Cisco customers and partners have asked for more in-depth training in being able to properly assess a replication problem and potentially resolve an issue without involving TAC.  This document discusses the basics needed to effectively troubleshoot and resolve replication issues. Replication Architecture CUCM 5.x Replication Architecture Communications Manager 5.x has a similar replication topology to Callmanager 4.X. They both follow a hub and spoke topology. The…

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ACE Load Balancing Briefing with Examples of HTTP

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ACE Load Balancing Briefing with Examples of HTTP   Configuration  Sequence 1- Servers 2-  Server Farm 3-Define Class-map for Virtual IP Address  [ that will be used to receive request for Load Balancing Servers  ] 4- Policy for Sever Farm 5- Policy for Load Balancing # Defining Servers server host SERVER1 ip address 172.168.12.10 inservice rserver host SERVER2 ip address 192.168.12.11 inservice rserver host SERVER3 ip address 192.168.12.12 inservice rserver host SERVER4 ip address 192.168.12.13…

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