3 votes

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

According to the Cisco 300 Series Managed Switches Data Sheet, the SG300 switches can do IPv4 routing: You will probably need to configure this on your switch. You will definitely need a firewall ...
Ron Maupin's user avatar
  • 99.6k
3 votes

How to use console serial cable for cisco SG300 switch?

Using a serial cable, connect that console port to the serial port on your computer (or a USB adapter), load up a terminal program, set it to 19,200115,200 Baud (thx jonathanjo), 8N1 and hit . Other ...
Zac67's user avatar
  • 84.4k
2 votes
Accepted

Really basic SG300 VLAN setup not working

You only tag VLANs on trunk interfaces. The tags are for the switches (or a switch-to-router link) on each end of the trunk link to be able to separate the frames back to the correct VLANs. On Access ...
Ron Maupin's user avatar
  • 99.6k
2 votes

How to disable ICMP type 9 (router advertisement) on SG300

I had the same problem (unwanted icmp type 9), leading to some assymetrical routes on my network (impacted devices are ILOs and PDUs), making packets beeing catched by RP-filtering on the gateway. I ...
Greg Giannoni's user avatar
2 votes
Accepted

SG300 - no traffic across trunk

"Port 25 on the SG300 is configured as a trunk, with VLANs 72 and 73 tagged." This does not make sense to me. Frames are tagged based on the access port they came from, not by a trunk port. default-...
Ronnie Royston's user avatar
2 votes
Accepted

Do Cisco SG300 switches perform CRC error correction?

Do Cisco SG300 switches perform CRC error correction? No, nor do any other Ethernet switches.[*] The Ethernet frame's frame check sequence algorithm cannot correct errors, it can only detect them - ...
Zac67's user avatar
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2 votes
Accepted

SG3xx Password Reset/Recovery

Cisco maintains documents for this type of thing. For your particular switch: Administrator Password Recovery for 300 and 500 Series Managed Switches
Ron Maupin's user avatar
  • 99.6k
1 vote

How to add ssh kex algorithms to cisco sg350

Key exchange mechanisms failing is usually an indication of incomplete key generation. The switch might not have local keys yet. Check whether that's the case: show crypto key If it's missing try ...
Zac67's user avatar
  • 84.4k
1 vote

STP and LAG Problems

Stack mode is not recommended for a pair of core switches as it is a shared control plane / single point of failure and software upgrade will result in core outage. This is not acceptable design. ...
Ronnie Royston's user avatar
1 vote
Accepted

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

You need to look at the standard for each. The MGBLX1 and the GLC-LH-SMD both have support for 1000BASE-LX. What you really need to do is make sure that these are compatible with the fiber which you ...
Ron Maupin's user avatar
  • 99.6k
1 vote

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

You just buy another one and plug it in to the existing one with a Cat5/6 cable (or two for redundancy via an etherchannel). If they are far apart, get the miniGBIC for multimode fiber x2 (one for ...
Ronnie Royston's user avatar
1 vote
Accepted

How to disable ICMP type 9 (router advertisement) on SG300

There does not appear to be a knob to disable IPv4 RA short of disabling layer 3 on the switch altogether. so: set system mode switch will do that. This causes your entire config to be reset to ...
ericx's user avatar
  • 153
1 vote
Accepted

Reducing broadcast traffic on Cisco SG300

Unfortunately it appears to be a bug in Cisco IOS: https://quickview.cloudapps.cisco.com/quickview/bug/CSCum51028
user73383's user avatar
1 vote

Reducing broadcast traffic on Cisco SG300

224.0.0.251 is the multicast (and not broadcast) address used by the apple Bonjour protocol but also by the associated multicast DNS (rfc6762) So there's two cause of traffic sent to this multicast ...
JFL's user avatar
  • 19.7k
1 vote
Accepted

Routing on SG300 with VLANs

It doesn't work because of a limitation of the SG300. The SG300 doesn't have routed ports. I set up a clean SG300 config but it was not possible to reach the ISP Gateway: Config of SG300: config-...
fips123's user avatar
  • 171
1 vote

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

I've seen it previously in an environment which worked fairly well, multiple SG300 switches, routing done at the L3 switch layer of the SG300 and then a Cisco ASA 55xx firewall on the edge of the ...
Ty Smith's user avatar
  • 533

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