Matt, The customer is telling me this and requires following:
1. 2xGiEthernet LAN interfaces should be assigned to the same single subnet 2. each link will be terminated on different customer switch which will be L2 switch 3. only one link should be active during time, 2nd link goes active only when primary dies 4. I am not allowed to use routing - so no IGP 5. something like floating single IP address assigned on LAN interfaces 6.LAN subnet will be advertised via BGP into MPLS cloud Possible solutions? - IRB - spanning tree will block one link, BVI interface will represent LAN IP address lets say "something like Vlan1 interface" - backup interface - same IP address assigned on both interfaces, one interface in standby mode (portfast configured on customer's switches) - any other solution? I know that bvi sux but is there any other option (if not counting backup interface feature)? Does it make some sense? I am allowed to use just built-in GiEthernet interfaces. And I am the SP. On Sat, Feb 19, 2011 at 4:33 AM, Matt Hill <[email protected]> wrote: > BVIs really suck badly. > > Who is telling you this? A customer or a service provider? > > So you cant use L3, you cant route, and you are not allowed to use L2. > What are you supposed to use? Two tin cans with a piece of string > between them? > > If its a customer say, "these are your options to connect to us". If > its an SP, then say , "tell me how to connect to you and what do your > other customers do?" > > The ASR is one of the more capable platforms around and it is > sacrilegious to lower them and put BVIs on them. Are you using the on > board interfaces? or the SPAs? You can make the SPAs L2 if you need > to. > > Everything you are trying to do seems fine but the guy you are > connecting to needs to get their act together. > > Cheers, > Matt > > CCIE #22386 > CCSI #31207 > > On 19 February 2011 07:12, E One <[email protected]> wrote: > > Sry guys, did not hit "reply to all" > > > > ---------- Forwarded message ---------- > > From: E One <[email protected]> > > Date: Fri, Feb 18, 2011 at 1:43 PM > > Subject: Re: [OSL | CCIE_RS] ASR1002 - Flex link possible? > > To: Matt Hill <[email protected]> > > > > > > Hello Matt, > > > > Thx for fast response! ASR1002 will be running 3 interfaces: WAN > GiEthernet > > into MPLS cloud and 2xGiEthernet interfaces facing customer's L2 > switches. > > > > I cannot create bundle of them because they will be terminating on 2 > > different switches. Yeah, I suggested to use L3 ports and use > primary/backup > > scenario but L3 > > > > and IGP solution was denied. Therefore I tried to find if Flex link > featute > > which is available on c7600 router would be possible here, but did not > find > > anything. > > > > Customer asked not tu run spanning tree if possible. Therefore not sure > if > > IRB is the option, but saw that there is something like spanning tree > > disable command possible under bridge group. My solution was to use > backup > > interface cmd - not sure how it will work ( tried just on dynamips whcih > did > > not work). Customer is expecting rapid failover so dunno about IRB and > > legacy spanning tree version. Also not sure - backup interface is > tracking > > just up/up state, maybe something like ip tracking would be possible with > > this? Please see topology in attachment. THX again Matt. Really > appreciate! > > > > ! > > interface FastEthernet0/0 > > backup interface FastEthernet0/1 > > ip address 2.2.2.2 255.0.0.0 > > speed 100 > > full-duplex > > bridge-group 1******this is from IRB try > > ! > > interface FastEthernet0/1 > > ip address 2.2.2.2 255.0.0.0 > > speed 100 > > full-duplex > > bridge-group 1***this is from IRB try > > ! > > ! > > interface BVI1 > > ip address 10.10.10.10 255.255.255.0 > > ! > > ! > > bridge irb > > ! > > ! > > bridge 1 protocol ieee > > bridge 1 route ip > > ! > > > > > > > > > > > > > > > > > > > > On Fri, Feb 18, 2011 at 1:12 PM, Matt Hill <[email protected]> wrote: > > > >> What are you trying to do? > >> > >> Essentially bundle two links together? > >> > >> We have a similar issue with these boxes. We are going to try using > >> L3 and just use an IGP to load balance that way. We have NFI if it > >> will work (well enough at least, as what Cisco says and what happens > >> in the SP/production environment are often rather different) because > >> we havent tested it yet. The concern we have revolves around QoS and > >> traffic handling. > >> > >> Or if you are happy with one link up and one down (like a Flex link > >> is) you could always make both links L3 and have a floating static > >> route pointing to the "backup" interface with a higher admin > >> distance... > >> > >> Remember Flex Links are an L2 term and an ASR is a router, not a switch. > >> > >> Cheers, > >> Matt > >> > >> CCIE #22386 > >> CCSI #31207 > >> > >> On 18 February 2011 19:18, E One <[email protected]> wrote: > >> > Hello guys, > >> > > >> > I am trying to find out if there is something like Flex link feature > >> > possible on Cisco ASR1002 router. I know that on switches and c7600 > >> series > >> > router it is possible but unfortunatelly did not find anything for > >> > > >> > ASR1002. Woul like to avoid usage of IRB and spanning tree on two LAN > >> > interfaces. Any hints? > >> > > >> > Let me know your opinion guys. > >> > > >> > Thanks. > >> > > >> > Peter > >> > _______________________________________________ > >> > For more information regarding industry leading CCIE Lab training, > please > >> visit www.ipexpert.com > >> > > >> > > > > _______________________________________________ > > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > > > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
