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Questions tagged [cisco-sg300]

For questions about or involving the Cisco SG300 switch.

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How to set the default VLAN on Cisco SG350 switches firmware 2.5.0.83

We've got a site with all its Cisco SG300 network switches configured with a custom default VLAN. Normally, we'd use the following commands to change the default VLAN: vlan database default-vlan vlan ...
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1 answer
121 views

How to add ssh kex algorithms to cisco sg350

This is in reference to question: Scan sg350-28 with Nessus Credentialed checks I have been working on this for the past couple weeks and think I have figured out what the issue is: [2022-02-15 21:11:...
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1 answer
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Do Cisco SG300 switches perform CRC error correction?

Cisco SG300 series switches are capable of detecting CRC errors as can be seen in the interface counters. But can they correct CRC errors and pass the frame along to the destination or the only way ...
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  • 103
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2 answers
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How can I connect (stack) two Cisco SG350 together?

I am building a storage network, physically separated from the data network. I have two Cisco SG350-28P-K9 V02 switches: One on the basement. Has two NAS, two ESX servers. (in use) One on the 4th ...
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2 answers
200 views

Connect 2 VLANs on Cisco SG300 with cable

I have a Cisco SG300 with 2 VLANs enabled, half the switch ports are on one VLAN, half is on the other. Both VLANs use the same subnet. I want traffic to travel between the 2 VLANs. I thought the 2 ...
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3 votes
1 answer
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SG3xx Password Reset/Recovery

Trying to reset a password for a number of switches I have. Didn't save the text file I had jotted it down in....of course. Connected via serial, but cannot seem to locate any concise info on ...
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2 votes
1 answer
9k views

How to use console serial cable for cisco SG300 switch?

I have cisco SG300-28P series managed switch. I'd like to change default ip which is (192.168.1.254). When I am trying to connect the switch using ethernet cable it is shown me there is no access, ...
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  • 21
2 votes
1 answer
1k views

Really basic SG300 VLAN setup not working

My understanding of VLANs may need improved, but isn't the idea that you can run multiple LANs at layer 2 level over the same router if VLANs are setup correctly on the SG300? If so, I fail to see how ...
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  • 123
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2 answers
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How to disable ICMP type 9 (router advertisement) on SG300

Oddly enough our cisco SG300's are making "Router Announcements"/"Mobile IP Advertisements" (ICMP type 9) via IPv4 (not IPv6). They are sourced from the IP/MAC of the switch and destined for 224.0.0.1/...
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  • 151
2 votes
4 answers
1k views

Reducing broadcast traffic on Cisco SG300

I have a Cisco SG300 Small business switch, and the GUI interface is creating a lot of broadcast traffic: Source IP (The GUI IP): 172.16.xx.254:5353, Destination IP (Broadcast) 224.0.0.251:5353 I ...
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6k views

Routing on SG300 with VLANs

My setup: I receive from my ISP a /24 public IP subnet (e.g: 20.20.20.0/24). Some of our departments want to have full control over their public IPs, so I split it up to several /27 subnets. For ...
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  • 171
2 votes
4 answers
2k views

Cisco SG300 as core switch, Router needed for separated vlans?

We will get a /24 public IP address range, and I have to seperate it into few departments. So my plan is to split the /24 network into several /27 networks. I wanted to use a Cisco SG300-10SFP to ...
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  • 171
4 votes
2 answers
3k views

SG300 - no traffic across trunk

This one's got me banging my head against a wall... likely a simple answer, but I've tried everything I know. I heard the internet's a smart place. :) Have an SG300-28MPP connected to a clients' ...
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  • 41
1 vote
3 answers
5k views

STP and LAG Problems

I'm having some trouble with STP on our network. I have created a 3 tier network made up of Dell and Cisco switches. The topology is as follows: The core consists of two Dell N4032 10Gbps switches in ...
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1 vote
2 answers
396 views

Is a connect between Cisco SG300 and Cisco ISR 2921 a good choice for cross connect?

We use a Cisco SG300 for small routing issues in one Part of our Network, now we want to create a cross connect between two locations. Between both Location we use a dark fibre from a provider. On the ...
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  • 423
1 vote
3 answers
3k views

How can I expand my office network with a SG300-28P switch?

At this moment, I have a SG300-28P switch, but it's running out of ports. I want to order another SG300-28p, but I have no idea what modules and cables I need to stack those switches. Does anyone ...
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6 votes
1 answer
541 views

Cisco SG300-52 SNMP ifInOctets Values Unreasonable

On the SG300-52, I've noticed that SNMP monitoring of LAGs versus regular switch ports give incorrect (way too large and unrealistic) values for the octets transferred. For simplicities sake, let's ...
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