What type of UDLD will I apply for the below links. What is Cisco best practice for UDLD in a layer 2 topology?
a.Etherchannel(L2) ports between the Core switches.
b.Trunk dot1q uplink ports from edge switches to Core switches.
c.Trunk dot1q links between the edge switches(chained)
Storm Control/Broadcast suppression
I would like to apply storm control/broadcast suppression on all dot1q trunk ports to protect the core switches from broadcast storms on all VLANS. Is this best practice to apply this technology in a layer 2 topology? How should I apply this to the below links.
a. Trunk dot1q uplinks ports between edge switches and core switches.
b. Trunk dot1q links ports between the two edge switches (chained)
Edge switches (Chained)
What does Cisco recommend for the max amount of edge switches chained together using dot1q trunk uplinks. The network in question has more than 25 Catalyst switches chained together.
you have up to 13 switches in daisy chain with a single GE uplink.
I would propose a new single fiber based cabling and/or I would think of some forms of stacking if the C3560 support the stackwise technology and stackwise cable. For C3750 the stackwise cable is 32Gbps capable.
In the first case you may need to add 24 ports fiber based linecards to your core switches.
Or are the switches distributed in a long run and you cannot connect them to the core/distribution switches ?
Possible suggestions in the short term:
use etherchannel of two GE in all the chain if possible: if you have 24 FE users in each switch you have 300 users in a chain this currently makes a 1:3 ratio between available BW and wire speed on user ports.
This is your 3560 have 24 ports or 24 users. If they have 48 FE ports and 40 users each you are currently in a ratio 1:5.
". . . if the C3560 support the stackwise technology and stackwise cable."
NB: 3560 doesn't.
Another possible option, to avoid the daisy chains, would be in place a distribution stack of 3750s, using the 3750G-12S model. In this stack, run fiber uplink from each edge 3560 to 3750G-12S device.
From the new 3750 stack, you can run one or more fiber gig connections to 6500s, or place a 3750 with copper in stack and you can use copper gig uplinks between 3750 stack and 6500s, or place 3750-E in stack and you can run 10 gig uplinks to 6500s. (BTW: such a "star" configuration will increase bandwidth to most edge switches and avoid daisy chain member failure blocking access to other downstream members [unless you've looped topology and are using STP].)
If you want to improve redundancy, run at least two fiber uplinks from each 3560 to different 3750 devices in stack in Etherchannel configuration (also adds available bandwidth to edge).
If you run routing on the 3750 stack, you can easily run uplinks from the stack to both 6500s and use both links activately.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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