[cisco-voip] help designing redundant SRST router with VG224s

[Lelio Fulgenzi]

I'm hoping I can get the groups help coming up with a design solution for a redundant SRST gateway solution to service a bank of VG224s. We have to service elevators, campus emergency phones, and provide a means to allow departments to have at least one phone that will work in the event of a system outage (this will be their fax machines). 

I've put some thought into it, but my networking skills aren't what they used to be. *sigh* 

I've attached an image. 

I'm thinking: 

    • installing two 3945s with switchport modules in them 
    • create a VLAN on each router to be the HSRP active/standby interface - VLAN 101 
    • assign two ports on each switch module to VLAN 101 and connect the routers to each other (two links for redundancy, port channel or whatever) 
    • create two point to point routed VLANs for each VG224 , on on router A for VG224 i/f 0, and one on router B for VG224 i/f 1 
    • connect each router using routed VLANs to the campus network 
    • create dial peers on router B to point to router A (HSRP Active) so that PSTN calls will be routed properly (and if there are any IP phones installed, or if the VG224 link to Router A is compromised) 
    • use EIGRP magic to make things work 

Questions: 

    • Will the standby router become active if the other router is powered off? My main concern is whether the VLAN interface will be in an appropriate "up/up" mode 


        • this FAQ seems to say yes: http://www.cisco.com/en/US/tech/tk648/tk362/technologies_q_and_a_item09186a00800a9679.shtml#q1 
    • 
I'd like to also put dial peers on Router A pointing to Router B in the case that Router B becomes active for some reason. From a previous post, this should be OK, because H323 dialpeer loop prevention is on by default. 
In general, do you think this will work? 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
"Bad grammar makes me [sic]" - Tshirt 

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