Some good presetation on BGP Links https://www.sanog.org/resources/sanog33/SANOG33_Tutorials-BGP_Communities_and_Geotags-Muhammad_Moinur_Rahman-DZCRD.pdf https://www.denog.de/media/DENOG10/day2_0900_communities-no-anim.pdf https://nsrc.org/workshops/2014/afnog-are/raw-attachment/wiki/Agenda/09-BGP-Communities.pdf
BGP – Do not advertise a network
Remove routes from Advertisement on a Forigate firewall Not to myself: 10.255.32.0/20 was wired on C1, local pref was missing. so it might make sens to add this to all incoming routes 'set local-preference 100', incoming there is no issue. show router route-map show router route-map config router route-map edit "EBGP-OUT-R2" config rule edit 1 …
BGP – Prevent becoming a Transit-AS
AS-Path FilteringNo-export CommunityPrefix-list FilteringDistribute List Filtering AS-Path Filtering ip as-path access-list 1 permit ^$ neighbor x.x.x.x filter-list 1 out No-export Community ip bgp-community new-format route-map NO-EXPORT ​set community no-export neighbor x.x.x.x route-map NO-EXPORT in neighbor x.x.x.x send-community Prefix-list Filtering ip prefix-list NO-TRANSIT permit x.x.x.x/x neighbor x.x.x.x prefix-list NO-TRANSIT out Distribute List Filtering access-list x deny x.x.x.x y.y.y.y …
BGP – MultiHoming
Cisco cisco01config show ip bgp summaryshow ip routeshow ip bgpcisco02config show ip bgp summaryshow ip routeEdgeRouter-Xedge01configshow ip routeedge02configshow ip routeFortiGateconfigget router info routing-table detailsTestsChanging the AS Numbersshow ip routeshow ip bgpOptimizing route mapscisco1show ip bgp neighbors 10.255.80.29 received-routesshow ip bgpshow ip routecisco2show ip bgp neighbors 10.255.80.28 received-routesshow ip routeBGP Prevent becoming an Transit ASNo-Export CommunityLinks …
Cisco Nexus Port-channel Issue
Some strange thing we came across the other day. After the Power outage one of the Port-channels did not came up. VPC consistency showed that the Port-channel has ports assigned on both Nexus Switches there should only be local ports connected. Even the remote port was configured for a different port channel. We ended up …
LAG Groups
Some collection of LAG configurations and status commands seen over time. LinuxManually ConfigurationStatusFreeBSDConfig ExampleStatusPermanentCheckpoint ConfigStatus - Clish Status - Expert ModeFortigateConfigStatusCisco - CatalystsConfig StatusLinks Linux Manually Configuration modprobe bonding mode=802.3ad ifconfig bond1 192.168.1.1 netmask 255.255.255.0 up ifenslave bond1 eth0 ifenslave bond1 eth1 The Permanent way depends on the distribution. Status cat /proc/net/bonding/bond1 Ethernet Channel Bonding …
Cisco Catalyst 9200 – Software Update
Looks that software maintainance on newer Cisco Catalysts running IOSXE is a bit diffrence. -- TLDR -- copy http://tftpboot.example.pp52.de/cat9k_lite_iosxe.17.09.05.SPA.bin flash: install add file flash:cat9k_lite_iosxe.17.09.05.SPA.bin install activate Copy the Image to the Switch copy http://tftpboot.rd.pp52.de/cat9k_lite_iosxe.17.09.05.SPA.bin flash: Setup the Boot enviroment c9200#conf t Enter configuration commands, one per line. End with CNTL/Z. de052-ne1-rt-cisco01(config)#boot system flash:packages.conf de052-ne1-rt-cisco01(config)#no boot …
Cisco IPv6 Unicast Routing
! ipv6 unicast-routing !
Cisco – QoS
After dealing with CBQoS in the past days, some observations i have made Cisco seams not to fill the SNMP variables on Catalyst 2960C /2960CG / 2960CX platforms. snmp genarator is picky about ordering. You may find this line "- source_indexes: [cbQosObjectsIndex, cbQosPolicyIndex]" in the GitHub Issues but this "- source_indexes: [cbQosPolicyIndex, cbQosObjectsIndex]" seams to …
Controlling the Power in my Homelab
I’ve been using Home Assistant for a while now, and it’s time to explore automation with my Homelab equipment. Home Assistant offers integrations for a wide range of power outlets and allows for the control of PoE ports as well. Usually i power things with ZigBee Power Plugs or over PoE if possible. Raspberry PI …
Cisco Policy Based NAT
ip access-list standard dialer1-acl    permit 10.0.0.0 255.0.0.0   permit 192.168.2.0 255.255.255.0 ip access-list standard vlan4-nat-acl    permit 10.0.0.0 255.255.255.0 route-map dialer1-nat permit 10 match ip address dialer1-acl match interface dialer1  route-map vlan4-nat permit 10   match ip address vlan4-acl    match interface vlan4 ip nat inside source route-map vlan4-nat interface vlan4 route-map vlan4-route permit …
Patrick Marc's Networks 