First off I'm a cisco noob so I relialize I'm probably asking a rediculous question. I am currently setting up a UC540 that I bought used that does not have a configuration. The problem I have encountered is the router is capable of pinging IP addresses but is unable to ping domain names. Furthermore I am unable to access internet resources from my workstation that is directly connected to the router. The router is directly connected to my cable modem.
keep in mid after trying what Soroush did suggest you that the ISP often filter the DNS queries and very possibly they are providing their DNS service . this implies that you ahve to take out the name-server configuration and to set in case an ip helper address on the vlan 1 (internal vlan) to address the request running on port 53.
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When you'll take away this config and completed the NAT issue an ipconfig /all on your PC ( or ifconfig with Linux) and share the results. If i am right and if your PC can ping your router, you will get the DNS ip addresses without config.
I have a 1711 Catalyst router hooked up behind a cable modem. I configured the router, copied running-config to startup-config then wrote it to memory with "write mem". I unplugged router to move it and when I plugged it back in, I had to start from scratch.
More than likely it is the config register. Your config did not dissappear it was still there but the config register was set to load a blank default config, someone may have done a password recovery or something previously , like the previous poster said change it to 0x2102 and make sure you have the correct boot statement.
Hello guys, hope everyone is well and staying safe. I'm studying for my CCNA and in my lab I have a 1921 router with a EHWIC-4ESG installed, which provides gig speed. I'm paying for 1Gbps to my ISP so would take advantage of that and if I connect any device directly to the modem, I get that speed. But when I connect those same devices to the gig switchports on the 1921, at max, I'll get 250Mbps. Here's what I've tried to far:
Correct, the maximum documented (aggregate) performance is 2.7 Gbps (table 1), but conversely, figure 1 recommends the 1921 for only WAN links of 15 Mbps. ISR performance is very variable depending on your configuration and your traffic mix.
Would depend on your definition of "loud". In general, "Enterprise" class network devices are often tucked away in a closet or data center, not usually something you want next to your desk. So, they can be somewhat noisy. Much of their noise comes from their fans, which often are variable speed. If they start to heat up, their fans get much louder.
Would depend on your definition of "loud". In general, "Enterprise" class network devices are often tucked away in a closet or data center, not usually something you want next to your desk. So, then can be, somewhat, noisy. Much or their noise comes from their fan(s), which are often variable speed. If they start to hit up, their fans get much louder.
Well, for example, I also have two Catalyst 3750s, which I don't use much, only for experimental stuff so I leave them off unless I want to mess around and they are pretty loud compared to the 1921. I can still hear the 1921s fan but its not unbearable. This whole set up is in my bedroom, so Im trying to keep it the sound at a minimum.
you probably are not getting all throughput due the that particular model not supporting at all, i do recall those router would required a extra license to bump up the total traffic aggregate, but i beleive it only starts with the 4k routers.
so if you don't want to replace that, probably you can call your ISP to drop the speed and cache in some money :), after a few months you can replace that old router with something high grade. Also check your ssh sessions on your router, you might have some pending consuming resources and dropping some performance when comes to forward traffic.
Cisco Systems, Inc. (using the trademark Cisco) is an American multinational digital communications technology conglomerate corporation headquartered in San Jose, California. Cisco develops, manufactures, and sells networking hardware, software, telecommunications equipment and other high-technology services and products.[3] Cisco specializes in specific tech markets, such as the Internet of things (IoT), domain security, videoconferencing, and energy management with leading products including Webex, OpenDNS, Jabber, Duo Security, Silicon One, and Jasper.
Cisco Systems was founded in December 1984 by Leonard Bosack and Sandy Lerner, two Stanford University computer scientists who had been instrumental in connecting computers at Stanford. They pioneered the concept of a local area network (LAN) being used to connect distant computers over a multiprotocol router system. The company went public in 1990 and by the end of the dot-com bubble in the year 2000, had a market capitalization of $500 billion, surpassing Microsoft as the world's most valuable company.[4][5]
Cisco Systems was founded in December 1984 by Sandy Lerner along with her husband Leonard Bosack. Lerner was the director of computer facilities for the Stanford University Graduate School of Business. Bosack was in charge of the Stanford University computer science department's computers.[8]
Cisco's initial product has roots in Stanford University's campus technology. In the early 1980s students and staff at Stanford, including Bosack, used technology on the campus to link all of the school's computer systems to talk to one another, creating a box that functioned as a multiprotocol router called the "Blue Box".[9] The Blue Box used circuitry made by Andy Bechtolsheim, and software that was originally written at Stanford by research engineer William Yeager.[9] Due to the underlying architecture, and its ability to scale well, Yeager's well-designed invention became a key to Cisco's early success.[10]
In 1985, Bosack and Stanford employee Kirk Lougheed began a project to formally network Stanford's campus.[9] They adapted Yeager's software into what became the foundation for Cisco IOS, despite Yeager's claims that he had been denied permission to sell the Blue Box commercially. On July 11, 1986, Bosack and Lougheed were forced to resign from Stanford and the university contemplated filing criminal complaints against Cisco and its founders for the theft of its software, hardware designs, and other intellectual properties.[9] In 1987, Stanford licensed the router software and two computer boards to Cisco.[9] In addition to Bosack, Lerner, Lougheed, Greg Satz (a programmer), and Richard Troiano (who handled sales), completed the early Cisco team.[9] The company's first CEO was Bill Graves, who held the position from 1987 to 1988.[11] In 1988, John Morgridge was appointed CEO.[12]
The name "Cisco" was derived from the city name San Francisco, which is why the company's engineers insisted on using the lower case "cisco" in its early years.[13] The logo is intended to depict the two towers of the Golden Gate Bridge.[14]
On February 16, 1990, Cisco Systems went public with a market capitalization of $224 million, and was listed on the NASDAQ stock exchange. On August 28, 1990, Lerner was fired. Upon hearing the news, her husband Bosack resigned in protest.[15]
Although Cisco was not the first company to develop and sell dedicated network nodes,[16] it was one of the first to sell commercially successful routers supporting multiple network protocols.[17] Classical, CPU-based architecture of early Cisco devices coupled with flexibility of operating system IOS allowed for keeping up with evolving technology needs by means of frequent software upgrades. Some popular models of that time (such as Cisco 2500) managed to stay in production for almost a decade virtually unchanged. The company was quick to capture the emerging service provider environment, entering the SP market with product lines such as Cisco 7000 and Cisco 8500.[18]
The Internet Protocol (IP) became widely adopted in the mid-to-late 1990s.[23] Cisco introduced products ranging from modem access shelves (AS5200) to core GSR routers, making them a major player in the market.[23] In late March 2000, at the height of the dot-com bubble, Cisco became the most valuable company in the world, with a market capitalization of more than $500 billion.[4][24] As of July 2014, with a market cap of about US$129 billion,[25] it was still one of the most valuable companies.[26]
The perceived complexity of programming routing functions in silicon led to the formation of several startups determined to find new ways to process IP and MPLS packets entirely in hardware and blur boundaries between routing and switching. One of them, Juniper Networks, shipped their first product in 1999 and by 2000 chipped away about 30% from Cisco SP Market share. In response, Cisco later developed homegrown ASICs and fast processing cards for GSR routers and Catalyst 6500 switches. In 2004, Cisco also started the migration to new high-end hardware CRS-1 and software architecture IOS XR.[27]
On the more traditional business side, Cisco continued to develop its routing, switching and security portfolio. The quickly growing importance of Ethernet also influenced the company's product lines. Limits of IOS and aging Crescendo architecture also forced Cisco to look at merchant silicon in the carrier Ethernet segment. This resulted in a new ASR 9000 product family intended to consolidate the company's carrier Ethernet and subscriber management business around EZChip-based hardware and IOS-XR.[18]
Cisco continued to be challenged by both domestic competitors Alcatel-Lucent, Juniper Networks, and an overseas competitor Huawei. Due to lower-than-expected profit in 2011, Cisco reduced annual expenses by $1 billion. The company cut around 3,000 employees with an early-retirement program who accepted a buyout and planned to eliminate as many as 10,000 jobs (around 14 percent of the 73,400 total employees before curtailment).[32][33] During the 2011 analyst call, Cisco's CEO John Chambers called out several competitors by name,[34] including Juniper and HP. 152ee80cbc
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