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- About brselzer
04-19-2019
brselzer
Member since
08-31-2016
Cisco Employee
04-19-2019
05:33 PM
Hello,
No, two switches in different domains will not be able to update each other:
https://www.cisco.com/c/en/us/support/docs/lan-switching/vtp/10558-21.html
"When the switch receives a summary advertisement packet, the switch compares the VTP domain name to its own VTP domain name. If the name is different, the switch simply ignores the packet. If the name is the same, the switch then compares the configuration revision to its own revision. If its own configuration revision is higher or equal, the packet is ignored. If it is lower, an advertisement request is sent."
Hope that helps!
... View more
04-18-2019
06:10 AM
Hello,
Make sure you have network-policy for LLDP enabled or it won't be able to communicate the right vlan:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_53_se/configuration/guide/2960scg/swlldp.html#41600
EXAMPLE:
Switch# configure terminal
Switch(config)# network-policy profile 1
Switch(config-network-policy)# voice vlan 100 cos 4
Switch(config-network-policy)# exit
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# network-policy profile 1
Switch(config-if)# lldp med-tlv-select network-policy
Hope that helps!
... View more
Created by
brselzer
in Other Network Architecture Subjects
in Other Network Architecture Subjects
04-18-2019
05:56 AM
04-18-2019
05:56 AM
Hello,
There are a couple that have their pros and cons. Each one will probably have some limitations depending on the technology you are trying to simulate:
GNS3 - https://www.gns3.com/
VIRL - http://get.virl.info/index.php
EVE - https://www.eve-ng.net/
There are probably even more but these are the ones I am aware of.
Hope that helps!
... View more
04-18-2019
05:24 AM
Is the phone running CDP?
show CDP neighbor
CDP is used to tell the phone what the voice vlan is so the phone can tag its packets with that vlan tag. If the phone doesn't run CDP, it won't be able to learn the vlan tag and all it's packets will still go into the access vlan and not the voice vlan.
If the phone does not support CDP, you can turn on LLDP and see if the phone runs LLDP. LLDP provides the same function that CDP does.
conf t
lldp run
Hope that helps!
... View more
Created by
brselzer
in Other Network Architecture Subjects
in Other Network Architecture Subjects
04-18-2019
05:17 AM
04-18-2019
05:17 AM
Hello,
There are a couple different options you have depending on what the platform you are going to use. These technologies might not be supported in packet tracer:
EVCs - Make the interfaces L2 and configure a BDI much like you would configure an SVI https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/ce/b_ce_xe-313s-asr920-book/b_ce_xe-313s-asr920-book_chapter_01.html
mLACP - Multichassis-etherchannel. Connect two ASRs into the same port-channel so they seem like one device to the downstream switch.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cether/configuration/15-0s/ce-multichass-lacp.html
IRB Bridging on older platfroms - Put two interfaces into the same bridge group so they can be in the same subnet. Not supported on newer models. Should use EVCs instead.
https://www.cisco.com/c/en/us/support/docs/lan-switching/integrated-routing-bridging-irb/17054-741-10.html#irbconfig
Unfortunately, packet tracer might not be advanced enough to simulate these technologies so you will have to figure out what platforms you are going to use and what technologies they support.
Hope that helps!
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04-18-2019
05:00 AM
Hello,
As Mark mentioned, you can write an ACL to block traffic in one direction. However, if you have a server in one vlan and users in another, putting an ACL is not going to work as the communication needs to be bi-directional even if you only want the users to be able to initiate the connection. If this is what you are trying to achieve, you might need to look into a statefull firewall or maybe configuring NAT to mask the clients on the inside.
Hope that helps!
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04-16-2019
06:25 AM
Hello,
I agree. Assuming no priority has been configured anywhere, SW4 Fa0/1 should go alternate based off of lowest mac. Can you paste the outputs of show spanning tree from SW3 and SW4?
Hope that helps!
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04-15-2019
06:55 AM
Hello,
Are you doing a file transfer from the same source to the same destination? Etherchannel does per flow load balancing and not per packet. Might be expected if you only have one source and one destination.
Hope that helps!
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04-12-2019
06:16 AM
Hello,
Question 1: Yes, CEF supports load balancing based on layer 4 ports.
Router(config)#ip cef load-sharing algorithm ? include-ports Algorithm that includes layer 4 ports <------- original Original algorithm tunnel Algorithm for use in tunnel only environments universal Algorithm for use in most environments
Question 2: CEF can not support fragmentation. If you look at the situations that CEF can not handle, fragmentation is one of them.
Router#show cef not-cef-switched
IPv4 CEF Packets passed on to next switching layer Slot No_adj No_encap Unsupp'ted Redirect Receive Options Access Frag <----Fragmentation packets can not be CEF switced RP 0 0 0 0 18413 0 0 0
Question 3: See answer to question 2
Hope that helps!
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04-12-2019
06:08 AM
Hello Julie,
Let me make sure I understand the problem. You have a customer that wants to pass BPDUs over your network. They have two sites. They want a BPDU that leave one site, to arrive at the other. Is that correct?
Right now from the config you sent, you are connected to the customer with just a trunk port. Because BPDUs are link local traffic, your switch will consume the BPDU instead of forwarding it.
If you want to forward BPDUs then you need to configure a protocol tunnel so that way traffic that comes in your switch from the customer is forwarded instead of consumed. Here is a document that describes how to configure it:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/l2pt.html
Basically you need to configure it on your devices on the ports that connect to the customer.
Hope that helps!
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04-09-2019
06:59 AM
Hello,
Thanks for the config. This is your config on the port connected to the customer? If so, you are not doing a dot1q tunnel, you are just trunking their vlan through your network. There is no way to tunnel BPDUs through your network with this config. You would need to setup a dot1q tunnel and add STP tunneling.
Hope that helps!
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04-08-2019
08:50 AM
I see, you have a dot1q tunnel configured and the customer expects to get their own BPDUs over the ISP (you), right? Do you have l2protocol tunnel stp configured on your side? Do you mind sharing your customer facing interface config? Thanks!
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04-08-2019
07:07 AM
Can you provide some more details? You customer network is connected to your network and they expect to get BPDUs from you? Not sure I understand the problem. Thanks!
... View more
04-07-2019
05:53 PM
Hello,
Please follow the following documentation:
https://www.cisco.com/c/en/us/products/microsoft-visio-stencils-faq.html
Basically, you need to post in a different forum. Go here:
https://supportforums.cisco.com/index.jspa
Click "View all topics" then go to Online Tools and Resources, choose Technical Documentation Ideas.
Hope that helps!
... View more
04-04-2019
05:44 AM
It should not, no. All bridge assurance does is turn on BPDUs in both directions so that each side knows if their peer goes down. It does not change your spanning-tree topology. It will still block in the correct places.
Hope that helps!
... View more
Friday
Hello, No, two switches in different domains will not be able to update
each other:
https://www.cisc...
Thursday
Hello, Make sure you have network-policy for LLDP enabled or it won't be
able to communicate the rig...
Created by
brselzer
in Other Network Architecture Subjects
Thursday
Thursday
Hello, There are a couple that have their pros and cons. Each one will
probably have some limitation...
Thursday
Is the phone running CDP? show CDP neighbor CDP is used to tell the
phone what the voice vlan is so ...
Created by
brselzer
in Other Network Architecture Subjects
Thursday
Thursday
Hello, There are a couple different options you have depending on what
the platform you are going to...
Thursday
Hello, As Mark mentioned, you can write an ACL to block traffic in one
direction. However, if you ha...
Tuesday
Hello, I agree. Assuming no priority has been configured anywhere, SW4
Fa0/1 should go alternate bas...
Monday
Hello, Are you doing a file transfer from the same source to the same
destination? Etherchannel does...
a week ago
Hello, Question 1: Yes, CEF supports load balancing based on layer 4
ports. Router(config)#ip cef lo...
Public Statistics
| Date Registered | 08-31-2016 10:37 AM |
| Date Last Visited | 04-19-2019 09:12 PM |
| Total Messages Posted | 134 |
| Total Helpful Votes Received | 140 |
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|---|---|
| 5 | |
| 10 | |
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