Questions tagged [bridge]

Network bridging describes the action taken by network equipment to allow two or more communication networks, or two or more network segments, to create an aggregate network. Bridging is distinct from routing which allows the networks to communicate independently as separate networks. A network bridge is a network device that connects more than one network segment. In the OSI model bridging acts in the first two layers, below the network layer.

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Cisco ASR9K Bridge Domain Loop

If multiples interfaces on a Cisco ASR 9K bridge domain are going to the same broadcast domain, can a loop occur ? Something like this : bridge-domain VLANX interface TenGigE0/0/0/0.X --> To ...
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what is the main function of root bridge and ring master?

When we learn the STP or RSTP,we all learn the election of root bridge, the lowest priority number or MAC address of switch will become the root bridge.So here is my first question: 1.So what can the ...
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Why does STP choose the lowest bridge ID as the root bridge?

The switch which has the lowest bridge ID can be the root bridge,and the bridge ID is made of priority and MAC address,that is , bridge ID = priority + MAC address So we will choose the switch which ...
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Why routers change mac address of frames (and bridge not)?

I learned that router change mac address of packet with that one of its own outgoing interface, while this doesn't happen with bridges. I find it difficult to understand the logic under this ...
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How do layer-2 devices (bridges/switches) join a multicast MAC address?

I was going through the IEEE 802.1Q (2018) standard on my own. The standard speaks about group addresses, and how these group addresses are learned by transit bridges, which is all fine. But how do ...
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With reference to Juniper MX , what's the difference between Bridge Domain and Learning Domain?

I am trying to understand the difference between bridge domain and learning domain. I have tried to read through documentation and Juniper MX series book but no success. Need to understand the ...
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Should snmpIfHCInUcastPkts include packets bigger than 1522 bytes? [closed]

Packets bigger than 1522 bytes (as counted by Spirent Test Center) are being forwarded (bridged) but not counted in the following hardware counters on an Open Network Linux device: ifHCInUcastPkts ...
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Cisco BDI not Forwarding L2 Traffic?

I'm new to interface bridging, and I have an ISR4431 running 03.16.04b.S on which I need to bridge between two interfaces for two hosts: One interface is connecting directly to a host, the other to a ...
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BPDU Header System ID Extension

Previously network switches was using the 8 byte field Bridge Priority to identify a root on the network.When networks grows and becomes complex vlan creation comes into play the 2 bytes Bridge ...
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How do routers. switches, bridges and hubs deal with corrupted data?

By data corruption I mean frame/packet corruption, we can stick to the corruption due to a collision for simplicity. I know that switches can detect frame corruption if they are not set to cut-...
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Why do WiFi bridges replace the source MAC Address with their own?

Ive read quite a bit about the issues i currently have with my Aruba WiFi Bridge 501 and the failure of DHCP going through, and as far as i can tell the issue is that the bridge replaces the MAC of ...
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What is the effect of having too many bridges / routers between 2 devices?

I am building a network, with each node connected to each other using fiber media converters. They are actually a bridge with 2 ports: one Ethernet and one optical (or one single-mode and one multi-...
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Unknown device mac address listed in switch table on start out

After playing a little bit with a topology randomly created in packet tracer, I figured out that the switch (Switch0) stores a unknown device mac address on start out, wich I think that it belongs to ...
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RV320 router between 2 access points and secondary VLAN [closed]

I have a Cisco RV320 that is sitting between 2 different routers/access points on my network. Essentially: My ISP's router/access point <-----> RV320 <-----> My other access point My ...
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meraki bridge mode: dhcp is untagged

We have the following set-up: +------+ +--------+ +--------+ |Router|-----| switch |-----| Meraki | +------+ +--------+ +--------+ | +---------+ ...
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How do I bridge a Cisco 860VAE-W from VDSL to Ethernet?

I've got a Cisco 860VAE-W which I'm trying to bridge. I picked it up because I was interested in learning a bit about an IOS device – I'm coming at this pretty raw. >show inventory NAME: "C867VAE-...
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packet filtering using bridge vs router

I have a question about the bridge vs router packet filtering using firewalls. I know the basics of the router and bridge and on which layers they work. I just wanna know that on bridge how does ...
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Bridges, hubs, switches and repeaters in subnetting

I'm learning to subnet and I'm constantly doing exercises on paper about this topic. I'm trying to breakdown a network into smaller subnets, given the number of hosts for each one. For now, I only ...
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Upgrading Cisco 819 to 809, can I connect devices to 2 routed ports and be on same subnet?

The company I work for has multiple remote "IoT" style sites connected back to the datacenter via a Cisco 819 cellular router. We are in the process of upgrading these to the newer Cisco IR809 routers ...
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Bridged Mode Networking vs. Network Bridge

I have just learned about bridged mode networking in VMWare and I wonder how is it different from the "bridge" used in physical world networking? According to what I've found myself so far, I guess ...
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Is Network Bridging secure [closed]

Bridging two network cars in Windows allows the two separate networks to connect. Assuming there are three NIC cards present in a machine: A, B and C. If I bridge NIC A and B, is there a possibility ...
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How does Kismet find WIRED devices when scanning Wi-Fi? [closed]

In an effort to better secure my Wi-Fi network by finding its weaknesses and mitigating them, I have employed the use of Kismet, a well known Wi-Fi security scanning tool. When I use Kismet to scan ...
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What is the bridging decision when getting ARP request?

Setup: Assume I have 3 VMs. VM1 VM2 and VM3. VM2 has two interfaces, say eth1 and eth3. eth1 is connected to VM1 physically and eth3 to VM3. I create a bridge on VM2 using brctl with eth1 and eth3. ...
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Does bridging add delay?

If I use a bridge to perform traffic sniffing like man in the middle will the bridge add a delay? And what word should I use delay or latency?
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Does bridge store ARP reply information?

In above picture, D is sending packet to E and bridges B1,B2,B3,B4 have no forwarding entries. Firstly, D sends packet to B3 nad B3's forwarding table is updated. B3 sends packet to B2. Therefore, B2'...
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Cisco Catalyst 3850 router VLAN bridge no routing

New to Cisco stuff so bear with me (only a little L2 Procurve experience). I have a development network connected to an Aruba/HPE managed switch feeding a trunk with tagged VLAN's to an internal ...
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5 answers
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What is a VLAN (really)?

My question is about the literal and precise meaning of the term "VLAN". According to IEEE 802.1Q-2014, a LAN is a single segment of a medium. A cable connecting a PC to a switch port is a single LAN. ...
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Discovering public ip from wifi signals, shodan, parent router NAT [closed]

MAC addresses innately do not change right? and you're able to scan for broadcasting APs where you'll be able to detect different nearby mac addresses of each AP.. Public IP addresses change, ...
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1 answer
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Bridging networks without NAT: how it's done?

I have quite limited networking experience, so probably i'm asking about very simple things. I'm reading about linux bridge interfaces, and documentation states that there is no NAT by default and ...
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How to make virtual devices on GNS3 be able to ping the physical host

I have had this problem already and figured out its reason. Basically the problem is that the virtual devices on GNS3 cannot ping the physical host and also the physical host cannot ping the virtual ...
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1 answer
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Cabling two access ports on the same switch from different VLANs

Theoretically would I be able to connect two switch ports together with a simple straight/cross cable on the same switch. If the two ports are in different VLANs (eg. 2 and 22) and ports are in ...
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Wifi ap bridge WLAN network with WAN network

Googling "WLAN Bridge" mostly gives results about WDS bridge (wifi device to wifi device communication) What i want to do is basically bridge the router's WLAN and WAN interface (disabling NAT, ...
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2 votes
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How to access to virtual interface with static IP thanks to VPN?

Question : Is it possible to use a VPN solution to access to a remote PC in the following context ? Context : Objective : We need to connect a specific software (that uses a particular port) to a ...
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Phone and PC network sharing one wifi bridge

We have a Cisco router from our T-mobile provider, two subnets on two ethernet ports: one subnet for PC data network, one subnet for IP phone network. The subnets have different IP addressing. As per ...
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3 votes
3 answers
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Force VLAN traffic through specified interfaces

I have two VLANs, VLAN1 for "clients" and VLAN2 for (web)servers. Both VLANs have two ports in etherchannel (one Cisco switch). I would like to put transparent (WAF) device in bridge mode between the ...
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Cisco router under workgroup bridge AP

My question is about addressing a Cisco router interface so that I can use both bridging through an access point as workgroup-bridge and also connect to the access point to configure it. Apologies ...
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Can a network bridge be viewed as a two port switch?

I never worked with bridges because they were no longer used when I first got internet at home, and I have some troubles understanding what exactly was the role of the switches. From my search I ...
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Working of bridges not making sense

I am reading the book on Data Communications and Networking by Behrouz A. Forouzan Suppose a device A on LAN 1 wants to connect to the device B on LAN 2 . Initially the bridge table is empty . ...
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Bridge for collision domains

I have read that a bridge/switch can be used to increase the number of collision domains in the network, but somewhere I also read that a bridge reduces collision domains. Is it possible for bridge to ...
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1 answer
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Cisco ISO - Are all interfaces assigned to bridges automatically?

I'm currently looking at configuring a second bridge on a cisco switch, however it appears that all interfaces are 'automatically' in the first bridging interface because they are part of Vlan1, which ...
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2 votes
3 answers
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How transparent bridging Wi-Fi with Ethernet works?

The way I understand (two-port) transparent bridging is that the bridge simply forwards packets to another segment on the network. But since the MAC address of the ethernet interface is different to ...
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Is there an "active" network tap (not just passive)? [closed]

Passive network taps seem to be pretty simple. What if I want an "active" network tap? Let's say I want to change some HTTP packets, for example add info etc. Another thing that would interest my ...
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1 vote
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How can I bridge multiple interfaces to a single one a Cisco ISR C891F but making each one able to communicate only to the destination interface?

As the question says: How can I bridge multiple interfaces to a single one on a Cisco ISR C891F, but making each one able to communicate only to the destination interface? Let's say I have ...
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1 vote
1 answer
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How can I prevent VLAN bridging on a Cisco switch

A Cisco switch (IOS) on our network configured with VLAN 7 and VLAN 8 as access VLANs (7 being the native for the trunk on the switch) had the VLANs bridged by someone who connected a patch cable from ...
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What is EB (Ethernet Bridge)? [closed]

I'm new to centos and networks and I was reading documents about how to use direct commands on centos7 firewall-cmd using man 1 firewall-cmd I saw this line: The first argument of each option has ...
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Accessing Internet from a different VLAN. Cisco 200-26

I have just had a cisco 200-26 smart switch with 24 ports. I have set the IP of VLAN1 (also management Lan) to 192.168.1.254. All ports except port 10 and 11 are assigned to VLAN1. Furthermore, I have ...
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Merging two networks

I am new to networking and I want to understand how to merge (bridge) two networks and what all things (parametres) change when the nerworks are merged. Can somebody explain more in an educational way?...
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Cannot bridge point-to-point between autonomous AP and lightweight AP

I'm doing some tests in a company, and I have some problems. My mission is to configure an autonomous AP Cisco AIRCAP-2602E, and do a Wi-Fi bridge point-to-point between a Cisco lightweight AP and ...
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Use iperf to split multiple tcp streams between 2 NIC on same client (similar to IxChariot)

I have 2 PCs connected to each other using two 1 Gbps ethernet link, to have an aggregate data bandwidth of 2 Gbps. In IxChariot, I can create multiple TCP pairs and split them into: PC1_LAN1 <-&...
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Bridge two QinQ interfaces on a juniper router

On a Juniper MX router I've got 2 interfaces that I need to bridge together. Interface A has QinQ configured: vlan-tags outer 0x8100.1 inner 0x8100.600 Interfaces B has QinQ configured vlan-tags ...
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