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Questions tagged [frame-relay]

For questions about Frame Relay. For instance, you have a location in a rural area, where no other connection is possible, therefore you want to setup a Frame Relay connection and need help configuring your router.

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Do X.25/Frame Relay/ATM/MPLS have their own switches?

In the context of networking when we say "switch" we always think of Ethernet switch. But do we have X.25 switch, Frame Relay switch, ATM switch, and MPLS switch? If yes, how are they ...
Noob_Guy's user avatar
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1 answer
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CRC R bit size to guarantee error free

For a Link Layer frame, it's common to include some bits for redundancy. Suppose we have a frame with X bits of actual data, and want Y bits of error-correction bits. What size do we need to choose ...
rahul chawla's user avatar
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1 answer
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X.25 packet formats

In the different packets types of X.25 can you please tell me what does M D Q and X stand for? Also what is P(S) and P(R)?
Muhammad Ahmad's user avatar
1 vote
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189 views

DHCP over Frame Relay [closed]

I have two co-operate buildings. Building A is connected to building B via frame relay. Building A has the main switch server (with VLAN info) and a DHCP server. I need Building B devices to receive ...
Orc Man's user avatar
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2 votes
1 answer
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packet-switching, circuit-switching, PVC and SVC

I am studying by this book: West, Jill. Network+ Guide to Networks.. [VitalSource]. What I understand from what is explained there is that there are two kind of virtual circuit technologies PVC and ...
Alekz GS4's user avatar
2 votes
1 answer
92 views

Need help to replicate the results of a tutorial on Frame Relay Configuration on Router. What do I need to change/add?

I'm having trouble getting the output shown at 03:14 here: Frame Relay configuration by Kevin Wallace My Network is 3 routers, each connected to the frame relay switch via Serial2/0 interface, with ...
Somenath Sinha's user avatar
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1 answer
471 views

WAN/Campus network design - Learning purposes

I am trying to build a WAN connecting various LAN's via frame-relay for learning purposes, i do not have that much experience with frame-relay or network design (mainly creating LAN's and connecting ...
Damian's user avatar
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2 answers
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How to understand the High-speed network link increase the data transmission rate only reduces the data transmission delay?

I am reading a document: 1.Transmission delay: (the time required for the host or router to send data frames, formula: transmission delay = data frame length / transmission rate). 2.Propagation delay:...
aircraft's user avatar
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1 vote
1 answer
454 views

Why are Frame Relay, ATM and MPLS called "Layer-2 VPN"?

A VPN results, when two physically separate networks become virtually one bigger network. But Frame Relay, ATM and MPLS don't do that, they just connect two network, but they don't unify them. So ...
watchme's user avatar
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2 votes
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563 views

Frame relay, PVC and DLCI

Regarding the frame relay technology, could you confirm to me that traffic using permanent virtual circuit use the same ISP routers in the path for all packets sent ? I'm a little bit confused. Frame ...
bdes31's user avatar
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1 vote
1 answer
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Assigning IP addresses in a Frame Relay network

I know one can design a network that connects several IP subnets with Frame Relay. I've come across two main configurations. Full mesh: Every router is connected with every other. Thus, I believe ...
Tendero's user avatar
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What problem does Frame Relay or ATM solve that Ethernet does not?

Frame Relay is a technology that exists from 1988 (more or less). Ethernet is older (mid 70's). Why we classify as a WAN technology Frame Relay if Ethernet can do the same (and even better!)? As far ...
T.G.'s user avatar
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1 answer
1k views

Loopback interfaces aren't advertised via RIPv2

My topology is as so R0 as Hub R1 and R2 as spoke R2 has a loopback of 2.2.2.2, and R3 has a loopback of 3.3.3.3 R1 can ping these addresses, and is advertising 2.0.0.0 and 3.0.0.0 in RIPv2. ...
Josh 's user avatar
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3 votes
1 answer
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When X.25 or ATM were used in ISP networks or Internet backbone was the protocol running over this layer still TCP/IP? [closed]

What was the protocol usually used on top of X.25 and ATM or even Frame Relay Networks when those were commonly used? Was it also TCP/IP protocol stack or some other protocol stack? From what I know ...
yoyo_fun's user avatar
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Is the auto-correlation of a frame transient based on the physical characteristics of a device?

I am currently studying ways to fingerprint Wi-Fi devices based on their physical characteristics and I was struck by a question after reading Section B of this paper http://www.ccs-labs.org/bib/...
Daniele's user avatar
1 vote
1 answer
279 views

In OSPF, do virtual links have a cost when looking at the routing table?

I have multiple routers connected to frame relay switches. I am using serial links from the routers to connect to the relay switches. I'm also using an unnumbered loopback address on all of the serial ...
Sou Thong's user avatar
1 vote
1 answer
232 views

Best internal(private) ip addressing practices for serial connections (IPv4)

i have the network topology in the diagram below. i was given the Internal address block of 100.1.0.0 for assigning IP addresses. Router 1 has a public ip address to the ISP router 2 i assigned it ...
Swannie's user avatar
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1 vote
1 answer
268 views

How is inverse ARP configured in frame relay?

I've tried to find an explanation online that just simply tells me how inverse ARP is configured, and I can't seem to find a straight answer for it. Let's use the below diagram as an example. As you ...
BabyPython's user avatar
3 votes
1 answer
2k views

Overlay Network and VPN

I would like to understand the difference between overlay networks and VPN? As far as I understand, they are based on virtual connection establishment between endpoints. How do they differ then?
Mike's user avatar
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2 votes
1 answer
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Load balancing across 2 Multi-link frame relay links- Verizon being difficult

We are provisioning a 4xT1 and a separate 3xT1 links to the same 2901 router with 4x VWIC3 - 2MFT T1 cards. Verizon claims they cannot bond all 7 into a 7xT1 and have thus provisioned us these 2 ...
Helkas's user avatar
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2 votes
1 answer
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How a ping from DLCI 102 going to DLCI 301 instead of 201?

I just configured a scenario of point to point frame relay. As shown in the figure, I mapped DLCI as shown below: 10:102 20:201 10:103 30:301 but I don't able to figure out how my ping from ...
Heisenberg's user avatar
3 votes
1 answer
287 views

Redundancy with Frame Relay

I wanted to understand how redundancy works when we implement Frame Relay to connect between different office locations. Consider the topology here I have two sites A and B each has a pair of Routers (...
charan's user avatar
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3 votes
1 answer
535 views

CDP over Frame-Relay

[R1]---[FRSW]---[R2] - is the topology. Everything is L2, there are no PVC's, all physical interfaces. At startup everything is running with HDLC. Enable CDP - we get CDP neighbors across the board....
A L's user avatar
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1 vote
0 answers
120 views

How do Wi-Fi access points discard frames on adjacent channels?

Naturally, Wi-Fi devices (access points, client adapters) receive frames that were sent on an adjacent channel as these overlap, i.e., they 'see' frames that were sent on a channel that the device ...
Fabian's user avatar
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3 votes
1 answer
1k views

How PVC works in frame relay?

When it comes to packet switching, it does not create a permanent physical path like Circuit switching. It uses packets and they use different paths to reach the destination. Also packet switching ...
Zac's user avatar
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6 votes
2 answers
4k views

OSPF manual neighbor configuration requirement on NBMA network

Why are OSPF neighbors manually configured on NBMA networks even when you enabled it with the broadcast keyword in frame map statements? Example is NBMA point-to-multipoint access. Thanks.
Jim's user avatar
  • 313
4 votes
1 answer
4k views

eigrp configuration problem over frame-relay

I have a set up with back to back connection with EIGRP over frame-relay, mention below the device connection setup using GNS3. Problem is: I am configuring EIGRP over frame-relay, but its not ...
user4927's user avatar
4 votes
2 answers
2k views

Frame Relay 'local significance' of a DLCI

I am currently studying for my CCNA exam and I am stuck at the concept of DLCIs in a network using frame relay encapsulation. This may be because I am a non native english speaker and misinterpret the ...
Marco's user avatar
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4 votes
1 answer
223 views

Strange ping over frame-relay network

Buffing up on Frame-Relay for testing EIGRP nuances over FR for CCNP - topology and relevant show command output here: https://i.sstatic.net/YUhcq.jpg Relevant PVC is between DLCI 103/301 (R1/R4) ...
A L's user avatar
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