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Hi community,
I have a customer which operates a DC split in two locations, and which uses back-to-back vPC + MST to interconnect those locations. Furthermore, L3 routing is handled by two Catalyst 9400 running HSRP. A network diagram is given belo...
Hello guys, I have some questions regarding MTU and the different way to configure it on Cisco devices and I don't find any good documentation on that particular topic. First of all, what will happen if a device receive a packet larger than the MTU o...
Hello guys, I have to perform a QoS design which leverage Shaping & CBWFQ and I have a question regarding buffering. Target platforms are ISR4431 & ISR 4451X. I'm quite of struggling to find the way IOS-XE allocate buffers and if the queue-limit fot ...
Hello Guys,
I'm using MPLS over GRE. The same router (an ISR 4k) is performing label imposition and tunneling.
From my understanding, Cisco IOS-XE default behavior for MPLS over GRE encapsulation is the following:
Copy IP precedence bits into MPLS EX...
Hello,
For some too-long-to-explain reasons, I have to deploy a, let’s face it, quite weird architecture. A very simplified diagram is enclosed. To summarize, each site has two WAN accesses. These WAN accesses have to be completely separated, even ...
Hi Christian, I thought it was the case, but when I read NX-OS Configuration Config Guide, there is this limitation stating that “Peer-switch can only be configured if both VPC peers share the same priority, and are root for all VLANs or MST instance...
Hello Pavel, thank you for the answer and sorry for my belated reaction. I have just another remark: if I enable BPDU Filtering on the inter-DC links, I guess the two vPC pairs will see themselves as MST root, so in that case I should probably keep p...
Hello Mark,
Ok, poor choice of words on my side... My customer ask me specifically if their spanning-tree design was OK after this outage or if there is something to change. They also wan't to add a new Nexus pair in one of the DC. Let's assume my qu...
Hi community,
Sorry to "resurrect" this (not-so) old topic, but I have a customer in the exact same situation (back-to-back vPC + MST) and I don’t want to miss something here and the information may be helpful to others. According to NX-OS Configurat...
