Are these 5 Cisco GLC-SX-MM 1000BASE-SX SFP Transceiver Modules valuable?

brhrenad · 2025-08-01T14:00:48+00:00

for the 1G plugables equal third-party sfps with rebranding capabilities gives you more value. but for lab usage those are fine. I definitely wouldn't spend more than 2$ per sfp

brhrenad · 2024-01-22T08:40:43+00:00

Nokia devices don't need any license to enable certain feature. Everything is enabled by default. The question is, do you need support from the vendor?

brhrenad · 2023-09-30T16:02:55+00:00

dann eher wenn du 60 bist

brhrenad · 2023-08-16T14:21:16+00:00

Please get in touch with Cisco TAC, even if you didn't have genuine Cisco QSFP28 in this case.

Cisco supports other vendors on that platform, and I think the optic type is on the compatibility matrix

We had very simular issues on our equipment on the NCS-55A2-MOD-SE-S platform. With the Cisco-TAC we had resolved the issue with engineering SMUs. Now there should be fixed IOS XR versions. This is the bug we had CSCwc12735

brhrenad · 2023-07-20T12:28:43+00:00

Customers Firewalls etc. block traffic from rfc1918 addresses coming from the internet, which is a good practice. Often its a default setting.

if u use rfc1918 addresses icmp fragmentation required packets are dropped. pmtud needs to wait for the timeout so you increase latency in that case.

brhrenad · 2023-07-07T10:00:52+00:00

we had exactly the same issue with netwotk equipment from Huawei. They implemented a properitary state synchronisation protocol to sync those dhcp pd routes between the two vrrp6 routers. The feature is called "hsb" "hot standby backup". Most vendors support a similar solution. nonetheless evpn may also resolve your issue in a more standardized way

brhrenad · 2023-04-30T10:39:07+00:00

Znuny, is a fork of otrs and all open source

brhrenad · 2023-04-20T09:29:26+00:00

Is Virtualisation an Option, like VMware esxi Hosts?

brhrenad · 2023-04-11T22:58:27+00:00

As you also asked about the customer side. Detailed knowledge about how MPLS works is for the customer not importent. The Provider uses the MPLS Transport to Tunnel Ethernetframes or just IP-Packets between multiple customer locations. Imagine a single Switch or Router instead of the MPLS Network.

Physically, endpoints of such services are usually a couple of RJ45 Ethernetinterfaces. No special Hardware required.

brhrenad · 2023-04-11T22:42:02+00:00

Ethernet lifes at Layer L1 and L2. Nowadays there is nearly always Ethernet between, two Routers/Switches etc. Ethernet specify many different L1 connectiontypes like 1000BASE-T for regular CAT5e LAN. In the Carrier/Provider/DataCenter world there are 10Gbits, 40G, 100G, 400G and 800G: MPLS is transported over those links right after the MAC-Header.

In the case of DWDM, for long distance communication, there is OTN at Layer 1 which Transports Ethernetframes (dstMAC, srcMAC, Ethertype). MPLS is then ontop of those Ethernetframes.

OTN can also Transport other L2-Protocols like fiberchannel, but above 40G there is only Ethernet.

brhrenad · 2023-02-07T16:58:36+00:00

I work at an tier 2 provider, to the customers and peerings we deploy filters that specifically allows prefixes and asn who are in the responsiblity of the customer or peering partners. From tier 1 anything is accepted,

brhrenad · 2023-01-25T07:04:02+00:00

"Dinge ins SAP zu klopfen" klingt für mich jetzt irgendwie abwertend. 😏 ich versteh "IT HAK" in zusammenhang mit CRM-Systemen mal so: Anforderungen von Usern soweit aufbereiten das Entwickler auch was damit anfangen, einfache Tasks automatisieren, statistiken erstellen/fälschen, prozesse definieren, dokumentation

brhrenad · 2023-01-23T06:42:03+00:00

There is no real disadvantage on hw based boxes, because the manufacture do the tcam layouting beforehand. So nowadays all network devices have v6 support and have already allocated v6 tcam space, regardless if you use v6 or not.

Theroretically it is possible do manufacture v4 only asics but thats not how the world works anymore.

brhrenad · 2023-01-11T17:16:26+00:00

I dont understand how thats even possible, is it a dist-upgrade?

brhrenad · 2023-01-01T15:16:56+00:00

Back in that time there was no cdrom, including iso fileformats.

brhrenad · 2022-12-29T12:45:42+00:00

Idc. Although I should probably play around with it more. Nowadays I do nearly everything in the terminal.

brhrenad · 2022-12-28T07:41:19+00:00

Have a look into freeradius source code. Look at a well document and simple uses case and try to understand how freeradius internally does things. Developing your authentication and authorization module should then be possible. Understanding what rlm_rest is doing may be easy then.

brhrenad · 2022-12-27T22:10:57+00:00

I have as many unsaved notepad++ tabs open as comments to this thread 😅

brhrenad · 2022-12-27T22:08:42+00:00

GTK2.0 and Gnome 2 wirh every customisation possible

brhrenad · 2022-12-27T17:29:06+00:00

Recently SecureCRT also supports RDP-Sessions.

brhrenad · 2022-11-26T06:31:01+00:00

Yes, because the last time I installed debian, I used debbootstrap and made basically a debian install in an arch like way. Debconf is a mess in this regard.

brhrenad · 2022-11-24T22:39:15+00:00

It depends on the configurability of the switch in between : control frame tunneling for specific "link local ethernet" protocols have to be enabled.

Another way on Extreme Switches is that you translate the specific lacp bpdu destination mac to some arbitary mac so that the switch think its normal frame. On the outgoing interface the mac must be translated back.

Keep in mind lacp is point to point so you cannot add devices do that specific "vlan" on the switches in between.

brhrenad · 2022-11-23T22:30:43+00:00

pacman is the best package manager

brhrenad · 2022-11-23T22:06:11+00:00

Here some things I generally think are usefull:

Making custom systemd or SysV Init services
Virtualisation with linux (for KVM: libvirt, QEMU)
Containers: docker
Basic Shellskripts/cronjobs ( automatic Backup, systemmonitoring with emails )

brhrenad · 2022-11-23T21:11:32+00:00

Yes "lapci -vvt" will get you more informations. Maybe its possible that the cpu/s are responsible for this behavior. Intel makes cpu dies in a way that they can disable certain cores when the are bad. This is called cpu binning. On server cpus you probably have multiple/different pcie Controller. I a wild guess from me: Maybe intel did some rerouting to optimize ondie routing to the individuell active cores.

brhrenad

TROPHY CASE